Summarize the following court judgment. Civil Appeal No. 1831 of 1973. Appeal by Special Leave from the Judgment and Order dated 4 5 1970 of the Allahabad High Court in Spl. Appeal No. 453/69. B. P. Maheshwari and Suresh Sethi for the Appellants. Ex Parte for the Respondents. The Judgment of the Court was delivered by SARKARIA	 J. This appeal is directed against a judgment	 dated May 4	 1970	 of the High Court of Allahabad. It arises in these circumstances: One Matadin	 father of Ram Lochan	 respondent 6 herein	 was a fixed rate tenant of the plots in dispute measuring 2.11 acres. One Ram Naresh Singh (deceased)	 brother of appellant 1 herein	 735 namely Mahadeo Prasad Singh	 obtained a money decree against Matadin on February 18	 1953 from the Judge	 Small Causes Court	 Varanasi suit No. 847 of 1953. Ram Naresh Singh sought to execute the decree. As a consequence	 the decree was transferred from the Court of the Judge of Small Causes to the Court of Munsif	 Varanasi	 for execution. The plots in dispute were put to auction by the executing court	 and were purchased by the decree holder on July 20	 1956. The sale was confirmed on August 29	 1956 and the sale certificate was issued on September 8	 1956. The decreeholder purchaser	 Ram Naresh Singh	 took delivery of possession over these plots on March 14	 1957. Thereafter	 he further sold the plots to appellant 2 and respondents 6 to 10. Matadin	 however	 died sometime in 1960. Thereafter his son Ram Lochan respondent 1	 herein	 instituted a suit on June 14	 1961 i.e. more than three years after the delivery of possession to the decree holder purchaser	 Ram Naresh Singh	 under section 229B read with Section 209 of the U. P. Zamindari Abolition and Land Reforms Act in the Revenue court against the present appellants	 for a declaration that he is in possession of the suit land as Bhoomidar. In the alternative	 he claimed the relief of possession on the same basis. He pleaded that his father	 Ram Naresh Singh was the original Bhoomidar and remained in possession of the suit land till his death and thereafter	 the plaintiff as the heir of the deceased continue in possession as Bhoomidar. He further alleged that the sale in favour of Ram Naresh Singh was without jurisdiction and a nullity; as it had been made without the knowledge of or notice to his father. The suit was resisted by the appellant	 who is original defendant 1	 and respondents 7 to 10	 who are original defendants 2 to 5	 inter alia on the ground that the suit was barred as res judicata and also under section 47 of the Code of Civil Procedure	 and Article 181 of the Limitation Act. Defendants 2 to 5 further pleaded that they were bona fide purchasers for value and	 therefore	 their rights in the suit land were protected under Section 41 of the Transfer of Property Act. They also	 alleged that they had made improvements on the suit land and were entitled to the benefit of Section 51 of the Transfer of Property Act. The trial court	 by its judgment	 dated August 30	 1965. dismissed the suit	 holding	 inter alia	 that It was barred by the principle of constructive res judicata as also under Section 47 of the Code of Civil Procedure; that the Revenue Court had no jurisdiction to entertain and try the suit; that the appellants 6 to 736 10 were bona fide purchasers for value and	 as such	 were entitled to the benefit of Sections 41 and 51 of the Transfer of Property Act; that the suit was barred by Article 181 of the Limitation Act	 1908 as well as by Section 34(5) of the U.P. Land Reforms Act; and that Ram Naresh Singh had been in possession since March 14	 1967	 i.e.	 the date on which he obtained delivery of possession in execution of his decree as auction purchaser. Aggrieved	 the plaintiff (respondent 1) preferred an appeal to the Court of the Additional Commissioner	 Varanasi	 who by his judgment dated December 28	 1965	 allowed the appeal and held that the executing court had no jurisdiction to sell the suit land under Section 42 of the Code of Civil Procedure	 as amended by the U.P. Civil Laws (Amendment) Act. 1954 and that the suit was not barred as res judicata or under Section 47 of the Code of Civil Procedure. The Additional Commissioner further held that the possession of Ram Naresh Singh was unlawful as it was on the basis of the void sale	 dated March 4	 1960	 which could not confer any title on him; that the judgment debtor had no knowledge about the execution proceedings; that the suit property worth Rs. 6	000 was for a very meagre amount and the sale was vitiated by fraud in publishing and conducting the sale. Ram Lochan and Ram Naresh Singh carried a second appeal against the decision to the Board of Revenue. During the pendency of that second appeal	 Ram Naresh Singh died and Mahadeo Prasad Singh	 appellant 1	 was substituted in his place. The Board dismissed the appeal on the ground that the auction sale with regard to the suit land in pursuance of the decree of the Judge	 Small Causes Court	 was void and	 as such	 did not invest the decree holder purchaser with any title and consequently	 the possession of the appellant was without any title. The Board further held that the auction sale did not affect the suit under Section 209 of the U.P. Zamindari Abolition and the Land Reforms Act. To impugn the judgment of the Board	 Mahadeo Prasad Singh	 appellant herein	 as well as respondents 6 to 10 filed a writ petition under Article 226 of the Constitution in the High Court of Allahabad. A learned Single Judge	 who heard the writ petition	 allowed it by his judgment	 dated April 23	 1969	 and quashed the judgments of the Board of Revenue as well as of the Additional Commissioner	 who are respondents 2 and 3 herein. Following an earlier judgment of a Division Bench of the same Court in Suraj Bux Singh vs Badri Prasad & Anr. the learned Judge held 737 that the execution sale of the suit land was proper as per the provisions of Section 42 of the Code of Civil Procedure; that prior to its amendment in U.P. by the U.P. Civil Laws (Amendment) Act 1954	 the executing court had the same powers in relation to execution as it would have had if the decree had been passed by itself; that the decree in the present suit was passed on February 18	 1953	 i.e. prior to the coming into force of the Amendment Act of 1954 and	 as such	 the amended Section 42 did not apply to it; and that the decree having been passed prior to the date of the amendment	 should be executed in accordance with the provisions of Section 42 as it stood prior to its amendment; and that as a result	 the suit for declaration as well as for possession would have to fail. The learned Single Judge did not go into the question as to whether the suit was barred by Section 47 of the Code of Civil Procedure. Against the judgment of the learned Single Judge	 respondent 1	 herein	 preferred a Special Appeal which was referred to a Full Bench of the High Court consisting of three learned Judges. The two Judges	 in majority	 held that the Small Cause Court had no power to execute the decree by attachment and sale of immovable property; that the transferee court	 namely	 the court of the Munsif had the same powers as that of the Small Cause Court and	 therefore	 that court also had no jurisdiction to execute the decree by attachment and sale of the immovable property; that the right to execute a decree by attachment and sale of immovable property is a matter of procedure	 while the right to realise the decretal amount by attachment and sale is a substantive right of the decree holder	 that the date on which the decree was put into execution	 the amendment of Section 42 had already come into force and the power of the transferee court had become co terminus with that of the transferor court; and that the amendment did not save the right of the appellant to execute the decree of the Small Causes Court by attachment and sale of immovable property. Sinha	 J. however	 dissented. He took the view that the Amendment Act did not apply to the present suit and that a substantive right had accrued to Ram Naresh Singh on the passing of the decree to execute it by attachment and sale of the immovable property and that right was clearly saved to him by virtue of Section 3 of the Amendment Act. In accordance with the view of the majority	 the appeal of respondent 1 was allowed and the Order of the learned Single Judge was set aside. Hence this appeal by special leave by the appellants. 738 Thus	 the principal question that falls to be considered in this appeal is whether the High Court was right in holding that the execution sale of the land in dispute was totally without jurisdiction and null and void. Some relevant dates may be noted. Ram Naresh obtained the decree from the Court of Small Causes on February 18	 1953. On the decree holder 's application under Section 39 of the Code of Civil Procedure	 the decree was transferred to the Court of the Munsif on January 24	 1955 and was put into execution after the U.P. (Amendment) Act XXIV of 1954 had come into force. This sale in favour of the decree holder himself took place on July 20	 1956. It was confirmed on August 29	 1956 and the sale certificate was issued to the purchaser on September 8	 1956. The auction purchaser took delivery of possession as per Dakhalnama on March 24	 1957. The decree holder purchaser further sold the plots in dispute to defendants 2 to 5. Next	 at this stage	 the relevant provisions of the Code of Civil Procedure and the U.P. Civil Laws (Reforms and Amendment) Act (Act No. XXIV of 1954) may be noticed. Section 38 of the Code of Civil Procedure provides that "a decree may be executed either by the Court which passed it or by the Court to which it is sent for execution". In the instant case	 as already seen	 the decree was passed by the Small Cause Court which was competent to execute it	 but (in view of Order 21	 Rule 82 of the Code) not by attachment and sale of the immovable property of the judgment debtor. That is to say	 that Court could execute it by attachment and sale of the movable property of the judgment debtor	 if it was	 of course	 not exempt under Section 60 of the Code of Civil Procedure or under any other law. Section 39 of the Code deals with transfer of decree. Its material part reads thus: "39(1).The Court which passed a decree may	 on the application of the decree holder	 send it for execution to another Court of competent jurisdiction (a) if the person against whom the decree is passed actually and voluntarily resides or carries on business	 or personally works for gain	 within the local limits of the jurisdiction of such other Court	 or (b)if such person has not property within the local limits of the jurisdiction of the Court which passed the decree sufficient to satisfy such decree and has property 739 within the local limits of the jurisdiction of such other Court	 or (c)if the decree directs the sale or delivery of immovable property situate outside the local limits of the jurisdiction of the Court which passed it	 or (d)if the court which passed the decree considers for any other reason	 which it shall record in writing	 that the decree should be executed by such other Court. (2)The Court which passed a decree may of its own motion send it for execution to any subordinate Court of competent jurisdiction. (3) . . . . . " In the instant case	 the decree was transferred under clause (d) of sub section (1) of Section 39. Unlike the other clauses (a) to (c) of the sub section	 it seems that under clause (d)	 the Court has a rational discretion to transfer or not to transfer the decree passed by it. This is apparent from the word "may" used in the opening part of sub section (1)	 and the requirement of recording reasons for the transfer under clause (d). It follows therefore	 that under Section 39 (1) a decree holder has no indefeasible right to get his application for transfer of decree to another Court ipso facto accepted by the Court which passed it	 particularly in a case which is not covered by clauses (a)	 (b) and (c) of that sub section. Section 42 of the Code indicates the powers of the transferee court for executing a transferred decree. The material part of this section	 prior to its amendment by the U.P. Act (No. XXIV) of 1954	 reads as under: "The Court executing a decree sent to it shall have the same powers in executing such decree as if it had been passed by itself. All persons disobeying or obstructing the execution of the decree shall be punishable by such Court in the same manner as if it had passed the decree. And its order in executing such decree shall be subject to the same rules in respect of appeal as if the decree had been passed by itself.". (emphasis added) The provisions in sub sections (2)	 (3) and (4) of the Section are not relevant for our purpose. The U.P. Act (No. XXIV of 1954) amended with effect from November 30	 1954	 Section 42 of the Code	 and after that amendment sub section (1) of the Section read as under: 740 "The Court executing the decree sent to it shall have the same power in executing such decree as if it had been passed by itself. All persons disobeying or obstructing the execution of decree shall be punished by such Court in the same manner as if it had passed the decree and its order in executing such decree shall be subject to the same rules in respect of appeal as if the decree had been passed by itself." (emphasis added) Thus	 for the words "as if it had been passed by itself" occurring in the first sentence of sub section (1) of Section 42	 the Amending Act 24 of 1954 substituted the words "as the Court which passed it". The effect of such substitution was that the powers of the transferee Court in executing the transferred decree became coterminous with the powers of the Court which had passed it. The result was that if the power of the transferor Court to execute its own decree were in any respect restricted	 the same restriction would attach to the powers of the transferee Court in executing the transferred decree	 notwithstanding the position that the powers of the transferee Court in executing its own decree were not so restricted. Section 3 of the U.P. Civil Laws (Reforms and Amendment) Act	 saves certain rights already acquired or accrued. It is in these terms: "3(1)Any amendment made by this Act shall not affect the validity	 invalidity	 effect or consequence of anything already done or suffered	 or any right	 title	 obligation or liability already acquired	 accrued or incurred or any release or discharge of or from any debt	 decree	 liability	 or any jurisdiction already exercised	 and any proceeding instituted or commenced in any Court prior to the commencement of this Act shall	 notwithstanding any amendment herein made	 continue to be heard and decided by such Court. (2)Where by reason of any amendment herein made in the Indian Limitation Act	 1908	 or any other enactment mentioned in column 2 of the schedule	 the period of limitation prescribed for any suit or appeal has been modified or a different period of limitation will hereafter govern any such suit or appeal	 then	 notwithstanding any amendment so made or the fact that the suit or appeal would now lie in a different Court	 the period of limitation applicable to a suit or appeal	 as aforesaid	 in which time has begun to run before the commencement of this Act	 shall continue to be the period 741 which but for the amendment so made would have been available. Before dealing with the contentions canvassed	 we may remind ourselves of some well known principles of interpretation in regard to the retrospective operation of statutes. As a general rule	 a statute which takes away or impairs substantive rights acquired under the existing law is construed to have a prospective operation unless the language of that statute expressly or by inevitable intendment compels a contrary construction. But this presumption as to prospective operation of a statute does not apply to an enactment affecting procedure or practice such as the Code of Civil Procedure. The reason is that no person has a vested right in any course of procedure. "The general principle indeed seems to be that alterations in the procedure are always retrospective	 unless there be some good reason against it". (See Mulla 's Code of Civil Procedure	 13th Edn. I	 page 6	 and In the light of the above principles	 the question posed for our decision	 resolves itself into the two fold issue : whether the decree holder had acquired a substantive right (a) to get the decree passed by the Court of Small Causes	 transferred to the Court of the Munsif and (b) thereafter to have is executed by the transferee Court in any of the modes provided in Section 51 of the Code of Civil Procedure	 including the mode by attachment and sale of the immovable property of the judgment debtor. As before the High Court	 here also	 it is contended on behalf of the decree holder that he had acquired this two fold substantive right before the coming into force of the U.P. (Amendment Act XXIV) of 1954	 and	 as such	 it was saved by Section 3(1) of this Amendment Act. It is maintained that the two fold right aforesaid is a substantive right and not merely a matter of procedure. Support for this argument has been sought from a decision of this Court in Garikapati vs Subbiah Choudhry. Reference has also been made to a Division Bench judgment of the Allahabad High Court in Suraj Bux Singh vs Badri Prasad. In the alternative	 it is submitted that assuming the sale was without jurisdiction	 then also	 that question would relate to the execution	 discharge or satisfaction of the decree and	 as such	 the remedy of the judgment debtor was to proceed by an application 742 under Section 47 of the Code of Civil Procedure and not by a suit as has been done by the plaintiff in the instant case. In short	 the argument is that in any event	 the present suit was barred by Section 47 of the Code. It appears to us that none of these contentions stands a close examination. It may be noted that the fasciculus of Sections 51 to 54 of the Code of Civil Procedure appear under the heading "PROCEDURE IN EXECUTION". Section 51 is captioned "Powers of Court to enforce execution". It reads thus : "Subject to such conditions and limitations as may be prescribed	 the Court may	 on the application of the decree holder	 order execution of the decree (a) by delivery of any property specifically decreed; (b) by attachment and sale or by sales without attachment of any property; (c) . . . . . . . . (d) by appointing a receiver; or (e) in such other manner as the nature of the relief granted may require : Provided that	 where the decree is for the payment of money	 execution by detention in prison shall not be ordered unless	 after giving the judgment debtor an opportunity of showing cause why he should not be committed to prison	 the Court	 for reasons recorded in writing	 is satisfied. . . ." This Section "merely enumerates the different modes of execution in general terms while the conditions and limitations under which alone the respective modes can be availed of are prescribed further on by different provisions". I.R. Commentaries Vol. I	 9th Edn. p. 863). The opening words of the Section "Subject to such conditions and limitations as may be prescribed" put it beyond doubt that there is no wide or unrestricted jurisdiction to order execution or to claim execution in every case in all the modes indicated therein. 'Prescribed ' has been defined in Section 2(16) of the Code to mean "prescribed by rules"	 and "rules"	 under Section 2(18) means "rules and forms" contained in the First Schedule of the Code or framed by the respective superior Courts in different States under Section 122 or Section 125. 743 We are one with the High Court (majority) that this phrase cannot be construed to mean that the powers of the executing Court under this Section are not subject to the other conditions and limitations enacted in the other sections of the Code. For instance	 the mode	 (b)	 by attachment and sale of the property of the judgment debtor	 may not be available in respect of property which falls within the exemption of section 60 of the Code. Although ordinarily the decree holder has an option to choose any particular mode for execution of his money decree	 it will not be correct to say that the Court has absolutely no discretion to place any limitation as to the mode in which the decree is to be executed. The option of the judgment debtor	 for instance	 to apply under Order 21. Rule 30	 C.P.C. for execution of a decree simultaneously against both the person and the property of the judgment debtor is subject to exercise by the Court of a judicial discretion vested in it under Order 21	 Rule 21	 C.P.C. We have already noticed	 that under Section 39(1) (d)	 the decree holder has no indefeasible	 substantive right to get a decree of a Court of Small Causes passed in his favour transferred to another Court. Cases are conceivable where the decree is of such a petty amount that the Court of Small Causes thinks that it can easily be executed by it by attachment and sale of the movable property of the judgment debtor. In the instant case	 also the decree was for a small amount of Rs. 300 and odd and we understand that the application for transfer was made under clause (d) of Section 39(1). Thus	 the decree holder 's right to make an application for transfer of his decree under section 39(1) (d) is a mere procedural right. The Court of Small Causes could in its discretion	 for reasons to be recorded	 refuse to transfer it to the Court of the Munsif. In other words	 the decree holder had no vested or substantive right to get the decree transferred to the Court of the Munsif for execution. The first limb of the issue is therefore answered against the appellant. As regards the second limb of the issue	 we find ourselves entirely in agreement with the High Court that the provisions of Section 51 are merely procedural in character. A decree holder gets a right to execute the decree only in accordance with the 744 procedure provided by law in force at the time when the execution is sought. If a mode of procedure different from the one which obtained at the date of the passing of the decree	 has been provided by law	 the decree holder is bound to proceed in execution according to the altered procedure. The Amendment Act XXIV of 1954 had taken away the power of the transferee court to execute the transferred decree by attachment and sale of the immovable property by making it coterminous with that of the transferor Court which	 in the instant case	 was the Small Cause Court and in view of the prohibition contained in Order 21	 Rule 82	 Code of Civil Procedure	 had no power to execute its decree by sale of immovable property. That being the position	 the Court of the Munsif to whom the decree had also been transferred for execution	 had also no jurisdiction to order sale of the immovable property of the judgment debtor. Thus considered	 the sale of the immovable property ordered by the Munsif in execution of the decree of the Court of Small Causes transferred to him	 was wholly without jurisdiction and a nullity. Once we come to the conclusion that the sale in question was totally null and void	 the alternative contention of the appellants with regard to the suit being barred by Section 47 of the Code of Civil Procedure	 does not survive. This is not a case of an irregular or voidable sale which continues to subsist so long as it is not set aside	 but of a sale which was entirely without jurisdiction. It was non est in the eye of law. Such a nullity does not from its very nature	 need setting aside. As pointed out by this Court in Kiran Singh vs Chaman Paswan	 ". it is a fundamental principle	 well established that a decree passed by a Court without jurisdiction	 is a nullity; and that its invalidity could be set up whenever it is sought to be enforced or relied upon	 even at the stage of execution	 and even in collateral proceedings". Most of the rulings which have been cited in support of their alternative contention by the appellants	 were also cited before 745 the High Court and have been rightly distinguished. We need not go into the same. Before we part with the judgment	 we may	 however	 note that the amendment made by the U.P. (Act XXIV) of 1954 was deleted by another U.P. (Amendment) Act XIV of 1970	 and the unamended sub section (1) of Section 42	 as it existed before the amendment of 1954	 was revived. But	 this Amendment Act (XIV of 1970) was not given retrospective operation. It did not affect the previous operation of the Amendment Act XXIV of 1954 or anything suffered or done thereunder. For the foregoing reasons	 we uphold the impugned judgment and dismiss this appeal. In view of the law point involved	 we leave the parties to pay and bear their own costs. P.B.R. Appeal dismissed.

A decree	 according to section 38 of the Code of Civil Procedure	 may be executed either by the Court which passed it or by the Court to which it is sent for execution. Section 39(1)(d) provides that the Court which passed a decree may	 on the application of the decree holder	 send it for execution to another Court of competent jurisdiction	 if the Court	 which passed the decree	 considers for any other reason	 which it shall record in writing	 that the decree should be executed by such other Court. Section 42 of the Code	 which indicates the powers of the transferee Court for executing the transferred decree	 before its amendment in 1954	 provided that the Court executing the decree sent to it	 shall have the same powers in executing such decree "as if it had been passed by itself." After the amendment the words "as the Court which has passed it" were substituted for the words "as if it has been passed by itself". Section 3 of the U.P. Civil Laws (Reform and Amendment) Act saved certain rights already acquired or accrued. In February	 1953 the brother of appellant No. 1 obtained a decree from the Court of Small Causes which on his application under section 39 of the Code	 was transferred to the Court of Munsif in January	 1955 and put into execution after the U.P. (Amendment) Act XXIV of 1954 had come into force. In the sale the decree holder himself purchased the land in July	 1956 and took possession of the property. He later sold the property to defendant nos. 2 to 5. The suit of respondent No. 1 for a declaration that the sale in favour of appellant No. 1 was without jurisdiction and therefore a nullity was dismissed by the trial Court. On appeal the Additional Commissioner held that the executing court had no jurisdiction to sell the suit land under section 42 of the C.P.C. as amended by the U. P. Civil Laws (Amendment) Act	 1954 Dismissing the appeal	 the Board of Revenue held that the auction sale in pursuance of the decree of the Judge	 Small Causes Court was void and did not invest the decree holder purchaser with any title. 733 On the appellant 's writ petition a single Judge of the High Court quashed the judgment of the Revenue Board as well as of the Additional Commissioner holding that the execution sale of the land was proper under section 42 of the Code	 that prior to its amendment by the U. P. Civil Laws (Amendment) Act	 1954	 the executing court had the same powers in relation to execution as it would have had if the decree had been passed by itself and the decree having been passed prior to the amendment of section 42 this section did not apply and the decree should have been executed in accordance with the provisions of section 42 prior to its amendment. On appeal a Full Bench of the High Court (by majority) held that since the Small Causes Court had no power to execute the decree by attachment and sale of immovable property	 the Munsif 's Court to which the decree was transferred for execution	 possessing the same powers as the Small Causes Court	 had no jurisdiction to execute the decree by attachment and sale of the immovable property. It was contended before this Court on behalf of the decree holder that he had acquired a substantive right to get the decree of the Court of Small Causes transferred to the Court of Munsif for execution and thereafter to have it executed by the transferee court in any of the modes provided in section 51 C.P.C. and this two fold substantive right having accrued to him before the coming into force of the 1954 Amendment	 it was saved by section 3 of this Amendment Act. Dismissing the appeal	 ^ HELD: 1 (a) Under section 39(1)(d) a decree holder has no indefeasible substantive right to get his application for transfer of a decree to another Court ipso facto accepted by the Court which passed it	 particularly in a case which is not covered by clauses (a)	 (b) & (c) of that sub section. The effect of substitution of the words "as the court which passed it" for the words "as if it had been passed by itself" was that powers of the transferee Court in executing the transferred decree became co terminus with the powers of the Court	 which passed it. Therefore	 if the power of the transferor Court to execute its own decree were in any respect restricted	 the same restriction would attach to the powers of the transferee Court in executing the transferred decree notwithstanding the position that the powers of the transferee Court in executing its own decree were not so restricted. [739E; 740C D] (b) The opening words of section 51 (subject to such conditions and limitations as may be prescribed) put it beyond doubt that there is no wide or unrestricted jurisdiction to order execution or to claim execution in every case in all the modes indicated therein. The High Court (per majority) was right in construing it to mean that the powers of the executing court under this section are not subject to the other conditions and limitations enacted in the other sections of the Code. Although ordinarily a decree holder has an option to choose any particular mode for execution of his money decree it may not be correct to say that the Court has absolutely no discretion to place any limitation as to the mode in which the decree is to be executed. [742G	 743A B] In the instant case	 the decree holder 's right to make an application for transfer of his decree under section 39(1)(d) is a mere procedural right. The Court of Small Causes could	 in its discretion for reasons to be recorded	 734 refuse to transfer it to the Court of Munsif. In other words the decree holder had no vested or substantive right to get the decree transferred to the Court of the Munsif for execution. [743F G] (c) The well settled principle in regard to the retrospective operation of statutes is that as a general rule	 a statute which takes away or impairs substantive rights acquired under the existing law is construed to have a prospective operation unless the language of that statute expressly or by inevitable intendment compels a contrary construction. But this presumption as to prospective operation of a statute does not apply to an enactment affecting procedure or practice such as the Code of Civil Procedure because no person has a vested right in any course of procedure. [741 B C] 2.(a) The High Court was right in holding that the provisions of section 51 are merely procedural in character. A decree holder gets a right to execute the decree only in accordance with the procedure provided by the law in force at the time when execution is sought. If a mode of procedure different from the one which obtained at the date of passing of the decree has been provided by law	 the decree holder is bound to proceed in execution according to the altered procedure. [744A B] (b) The Amendment Act XXIV of 1954 had taken away the power of transferee Court to execute the transferred decree by attachment and sale of the immovable property by making it co terminus with that of the transferor Court (the Small Cause Court) and in view of the prohibition contained in Order 21 Rule 82 C.P.C. it had no power to execute its decree by sale of immovable property. That being the position	 the Court of the Munsif to which the decree had been transferred for execution had no jurisdiction to order sale of the immovable property of the judgment debtor. The sale ordered by the Munsif in execution of the decree of the Court of Small Causes transferred to him was	 therefore	 wholly without jurisdiction and a nullity. [744 B D] Kiran Singh vs Chaman Paswan	 ; referred to.