Summarize the following court judgment. Civil Appeals Nos. 247 and 248 1975. Appeals by special leave from the Judgment and order dated the 29th May	 1974 of the Kerala High Court in original Petition No. 5463 of 1971. Krishnamoorthy Iyer and N. Sudhakaran	 fol the appellant (in appeal No. 247/75 and respondent No. 2 in C.A. No. 248/75). T. C. Raghavan and P. K. Pillai	 for respondent no.1 (in both the appeals). K. T. Harindranath (in C.A. No. 248/75) and K. R. Nambiyar. (for respondent No	 2 in C.A. No. 247 and the appellant in C.A. No. 248/75). 376 The Judgment of the Court was delivered by `CHANDRACHUD	 J. This appeal by special leaves arises out of the judgment of the High Court of Kerala in Writ Petition No. 5463 of 1971. That petition was filed by the The respondent A. Satyavan against the State of Kerala	 the Director of the department of Museums and Zoos	 Trivandrum and the appellant Smt. V. A. Subhadra. The main relief sought by the Ist respondent was that the order passed by 1 the State of Kerala on March ]8	 1971 appointing the appellant as an Upper Division Clerk in the Department of Museums and Zoos be quashed. The appellant was appointed as a Lower Division Clerk ill the Department of Museums and Zoos	 Trivandrum in 1949. She was confirmed in that post in 1950. The Ist respondent was appointed as a Lower Division Clerk in The same Department in 1955 and was confirmed ill 1963. On April 9	 1962 the appellant	 on her own request department transfer to the Department of Agriculture. her rank was an inter departmental transfer. Though on transfer the appellant became the junior most employee in the Department of Agriculture	 her rank and lien were maintained in the Department of Museums and Zoos. In course of time vacancy arose in the post of the Upper Division Clerk in the Department of Museums and zoos. One M. section Pillai was the senior most Lower Division Clerk in that Department but when The post of promotion was offered to him he declined it on the ground of ill health. The appellant was next in order of seniority amongst the Lower Division Clerks ill the Department of Museums and Zoos and since her rank and lien in that Department were maintained	 she was offered the post of the Upper Division Clerk. She conveyed her inability to accept that post for the time being and thereupon the 1st respondent	 who was next in order of seniority	 was appointed provisionally as an Upper Division Clerk. His appointment was made without prejudice to the claims of the seniors in the Department of Museums and Zoos. on the retirement of M. section Pillai	 a permanent vacancy in the post of the Upper Division Clerk arose in the Department of Museums and Zoos. On July 6	 1970 the appellant	 who was working in the Department of Agriculture	 conveyed her willingness to accept that post. By an order dated March 18	 1971 she was appointed as an Upper Division Clerk and later on May 3	 1971 she was further promoted as a Senior Superintendent. Both of these appointments as also the order by which his representation was rejected by the Government	 were challenged in the Writ Petition by the 1st respondent. The High Court of Kerala allowed the writ petition holding that under the relevant rules	 the appellant was not entitled to be re transferred to her parent department and without a valid order of re transfer she could not be appointed as an Upper Division Clerk in that Department. The High Court therefore quashed the order dated March 18. ;1 1971 by which the appellant was appointed as an Upper Division Clerk and the orders consequent upon it. 377 There are two things in favour of the appellant and they must first be mentioned. The order dated April 9	 1962 passed by the Director of Museums and Zoos by which the appellant was transferred to the Department of Agriculture expressly mentions that her lien and rank will be maintained in the Department of Museums and zoos. It is therefore plain that if and when the appellant rejoined the Department of Museums and Zoos in conformity with the rules and regulations	 she would occupy the rank which she would have occupied but for her transfer to the Department of Agriculture. Secondly	 the order dated April 4	 1968 passed by the Director of Museums and Zoos by which the 1st respondent was appointed as an Upper Division Clerk in the Department of Museums and Zoos mentions expressly that he was appointed in the higher post for the time being only and that the appointment was made without prejudice to the claims of his seniors. In the Department of Museums and Zoos the appellant was senior to the 1st respondent and therefore her claim of seniority would not be affected by the appointment of the 1st respondent as an Upper Division In spite of this position	 the appellant 's appointment as an Upper Division Clerk in the Department of Museums and Zoos is invalid because such an appointment could be made only if	 in the first place	 the appellant was entitled under the relevant rules to return to her parent . department. It was common ground that the appellant 's right to re turn to the Department of Museums and Zoos was governed by the notification issued by the Government of Kerala on January 2	 1961. Paragraph 2 of that notification reads thus: : A permanent person need not be required to relinquish his permanency. He may be permitted to retain his permanent lien in the old post until he is confirms in the new unit or department	 but he can come back to the old unit or department only if and when there is no vacancy for him to continue in the new unit	 or if for any reason his pay in the substantive post in the parent department becomes higher than the pay of the new post held by him. " It is clear from this provision that a person can return to his parent department ill one of the two contingencies only. He can return if There is no vacancy for him to continue ill the new unit to which he is transferred. Admittedly	 there was a vacancy available to the appellant in the Department of Agriculture in which she could have continued and therefore this clause has no application. The second contingency in which a person can return to his parent Department is if his pay in the substantive post in the parent department becomes higher than his pay in the post held by him in the department to which he is transferred. The question which arises for consideration is whether by reason of this clause	 The appellant was entitled to go back to her old unit. If she would validly go back	 there is no doubt that it was open to the Government to appoint her to the post of an Upper Division Clerk. The High Court	 in our opinion	 was right in taking the view that "pay ill the substantive post in the parent department" means the pay 378 attached to the post substantively held by the employee on the date of transfer to another department. since the substantive post held by the appellant on the date of her transfer to the Department of Agriculture was that of a Lower Division Clerk	 what must be considered is whether the pay which the appellant would have drawn in that post	 had she continued in her parent department	 had for any reason become higher than the pay drawn by her in the post held by her in the Department of ' Agriculture. It is undisputed that the pay which the appellant would have drawn as an Upper Division Clerk in her parent department on March 18	 1971 was not higher than the pay which she was drawing in the Department of Agriculture. Since under Paragraph 2	 an employee can come back to his old unit or department	 "only if and when either of the two conditions is satisfied	 the appellant was not entitled to return to her parent department. Unless she could validly revert to her old unit	 she could not be appointed to a post higher than the one substantively held by her in that unit on the date of her transfer. It is urged on behalf of the appellant that the pay which she would draw in the post of an Upper Division Clerk in tile parent department after her re transfer to that department	 would be higher than the pay which she was drawing In the post which she was holding in the Department of Agriculture and therefore she would be entitled to re 1) turn to her parent department under the second of the two condition mentioned above. It is impossible to accept this contention. The substantive post held by the appellant	 apart from the impugned order of promotion	 was that of a Lower Division Clerk in the Department of Museums and Zoos. The comparison therefore has to be between the pay of that post and the pay of the post which the appellant was holding in the department to which she was transferred. The order dated March 18	 1961 by which the appellant was appointed as an Upper Division Clerk in the Department of Museums and Zoos is therefore illegal and was rightly quashed by the High Court. 'the order dated May 3	 1971 further promoting the appellant as a Senior Superintendent must fall with that order. The appeal is accordingly dismissed. F Civil Appeal No. 248 of 1975: 	 This appeal is filed by the state of Kerala against the same judgment of the High Court which gave rise to the appeal just disposed of by us. In accordance with the view taken by us in C.A. No. 247 of 1975	 this appeal must be dismissed. While admitting these two appeals	 this Court had directed that the Government of Kerala shall pay the costs of the 1st respondent	 A. Satyavan	 in any event. Accordingly	 the Government of Kerala shall pay the costs of the 1st respondent. Costs shall be in one set only. P.B.R. Appeal dismissed.

The appellant who was a Lower Division Clerk in a department of the State Government had gone on transfer to another department on her own request. Under a notification issued by the State Government. a person could revert to his parent department (i) only if and when there is no vacancy for him to continue in the new unit or (ii) if for any reason his pay in the substantive post in the parent department becomes higher than the pay of the new post held by him. The appellant was offered a temporary post of U.D.C. in the parent department but she declined. The first respondent was therefore promoted to the post. When a permanent vacancy of Upper Division Clerk occurred in the parent department the appellant was appointed to the post and was later promoted to higher post. In a petition under article 226 of the Constitution filed by respondent No. 1 the High Court quashed the order of the appellant 's appointment and her promotion to the higher post. Dismissing the appeal to this Court. ^ HELD: The order by which the appellant was appointed as an Upper Division Clerk in the parent department was illegal and was rightly quashed by the High Court. The order promoting the appellant must fall with that order. [378F] (I ) Since under paragraph of the notification an employee can come back to his old unit or department "only if and when" either of the two conditions is satisfied. the appellant was not entitled to return to her parent department. Unless she could validly revert to her old unit she could not be appointed to a roost higher than the one substantively held by her in that unit on the date of her transfer. [378B C] (2) Pay in the substantive post in the parent department means the pay attached to the Post substantively held by an employee on the date of transfer to another department. The pay which the appellant would have drawn as an Upper Division Clerk in her parent department on the date of her appointment was not higher. than the pay which she was drawing in the new unit. The substantive post held by the appellant apart from the impugned order of promotion was that of a Lower Division Clerk. The comparison therefore has to be between the pay of that post and the pay of the post which the appellant was holding in the department to which she was transferred. [377 H	 378E]