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EXHIBIT 4.20 Contract of Engagement for
Member of Executive Board Between SAP Aktiengesellschaft
          Systeme, Anwendungen, Produkte
          in der Datenverarbeitung
          Neurottstrasse 16
          69190 Walldorf, Germany  which is represented herein by its Supervisory Board,
           which is represented herein by the Compensation Committee,
           which is represented herein by its chairperson,
           Prof. Dr. h. c. Hasso Plattner (SAP herein) And Dr. Peter Zencke,
          Im Wollenklingen 18, 69517 Gorxheimertal (Board Member herein) Preamble It is the wish of the parties hereto that Mr. Zencke be appointed to the SAP Executive Board for
the period commencing January 1, 2005 and ending December 31, 2006. This Contract of Engagement
contains the terms of service underlying such appointment. These present terms replace the previous terms of service as Executive Board Member between Board
Member and SAP. Article 1
Duties and Powers of Board Member  1.
    Board Member will conduct the affairs of SAP together with other Board Members of the SAP
Executive Board.2.
    Board Member will perform the duties of his or her office with proper commercial care and
will, in his or her actions, comply with the provisions of the law, the Articles of
Incorporation of SAP, the SAP Executive Board Rules of Procedure, the list of transactions
requiring consent given by the Supervisory Board, the resolutions of the General Meeting of
Shareholders and of the Supervisory Board, this Contract of Engagement, SAPs Principles of
Corporate Governance, and the Code of Business Conduct for Employees of SAP, each as amended
from time to time.3.
    In court and out of court, Board Member will act for and on behalf of SAP as provided by the
law and subject to the rules applying at SAP. Details of Board Members authority to manage
the business are subject to amendment at any time.




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-2-  4.
    Board Member will exercise the rights and perform the duties of an employer as provided in
labor and social-security law.5.
    At SAPs request, Board Member will accept appointments to governing bodies of SAPs
affiliates and appointments to governing bodies of and honorary offices in associations. At
any time on SAPs request and in any case not later than the end of this Contract, Board
Member will, so far as possible in law, relinquish such appointments and offices or transfer
them to such other persons as SAP directs. Article 2
Working Time and Secondary Employment  1.
    Board Member will commit his or her entire working effort, knowledge, and expertise to the
service of SAP. Board Member is free to determine his or her own working hours. However, he or
she must at all times be available to SAP and deal with SAP business so far as necessary in
SAPs interests.2.
    Before accepting any paid or honorary employment, notably Board Membership of any governing
body, Board Member must obtain the written consent of the Supervisory Board, which consent may
be withdrawn at any time. Article 3
Compensation  1.
    Board Member will receive a fixed gross annual base salary of  412,000.00(four hundred
twelve thousand) in 12 equal installments.2.
    Board Member will receive a Board Members profit-sharing component (Bonus herein) oriented
to his or her personal performance. The details are set out in a target agreement, which is
annexed to this Contract, between the Supervisory Board and Board Member and has to be
covenant each fiscal year. The target agreement for each actual year is expressly incorporated
into this Contract. The calculation of the profit-sharing component is based on the following:
within a 100 percentage target achievement the target bonus will amount to one annual base
salary.If for any fiscal year the Supervisory Board does not set a target, Board Member is entitled to a
minimum Bonus, amounting to the annual base salary. (Appendix: Bonus Schedule Board Members
2005)If during a fiscal year Board Members appointment to the Executive Board is revoked for just
cause in accordance with the German Stock Corporation Act, section 84 (3), Board Member is not
entitled to Bonus for that fiscal year.The Supervisory Board can postpone payment of the Bonus if the General Meeting of Shareholders
does not formally approve the acts of the Executive Board and there are serious reasons.The Bonus is payable after the General Meeting of Shareholders that receives the financial
statements for the fiscal year to which the Bonus applies.




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-3-  3.
    The aforesaid salary parts in No. 1 and No. 2 build up the annual target salary.4.
    Board Member will participate in SAPs stock-based compensation plan if there is one for the
fiscal year. SAP will decide the extent and terms of any stock-based compensation at its own
discretion.5.
    Each year, the Supervisory Board will examine Board Members total compensation in the light
of SAPs revenue situation, Board Members own performance in the preceding fiscal year,
trends in Executive Board Members compensation in comparable companies in Germany,
Europe, and the world, and general monetary inflation, and may at its discretion make a
reasonable adjustment to Board Members total compensation.6.
    Except so far as otherwise provided above, the compensation components described above will
be paid pro rata temporisin respect of any incomplete year in the term of this Contract. Article 4
Continuation of Compensation on Board Members Death If Board Member dies during the term of this Contract, payment of compensation pursuant to article
3 (1) in this Contract will be continued for the month of Board Members death and for the next
three months thereafter and will be made to Board Members spouse or, if Board Member has no
spouse, to Board Members dependent children as joint creditors. No dependents pension pursuant to
article 14 in this Contract is payable in respect of that period. Article 5
Other Benefits and Expenses  1.
    SAP will make a company car available to Board Member for business and private use during the
term of this Contract. SAP will bear the cost of the company car, including but not limited to
the running expenses. All tax liability in respect of private use will be borne by Board
Member. The company car regulations posted in SAPNet also apply as amended from time to time.2.
    SAP will at its own expense take accident insurance with the following cover for Board
Members benefit: Death            Two times the fixed annual salary Invalidity            Three times the fixed annual salary  SAP will take the insurance on terms that provide that the beneficiary or beneficiaries of death
benefit are the person or persons nominated for that purpose by Board Member or, in the absence
of such nomination, Board Members estate.Income tax on the premiums is payable by Board Member.3.
    SAP will also take Board Members and officers liability insurance for Board Members
benefit.




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-4-  4.
    Board Members travel and other expenses incurred and disbursements made on SAP business will
be reimbursed to Board Member in accordance with the rules generally applicable from time to
time on presentation of documentation appropriate for tax purposes. Article 6
Intellectual Property The purpose of all of the work that Board Member does during the term of this Contract including
but not limited to inventions and suggestions for technical improvements that Board Member makes
and computer programs, other works, and databases that Board Member creates (collectively Works
and Inventions herein) is to permanently benefit the SAP group, pursuant to its corporate purpose,
and its customers worldwide.  1.
    Board Member hereby grants to SAP comprehensive, exclusive, perpetual, worldwide rights under
license to use and exploit all Works and Inventions that are created or made by Board Member
in performance of duties in this Contract and for which authorship, copyright, patent,
trademark, design patent, or any other protection is available. The exclusive license rights
granted encompass the unrestricted right to use and exploit the Works and Inventions in the
following ways and for the following purposes:  a)
    The unrestricted physical copying of Works and Inventions and distribution of any number
of copies, editions and recordings of Works and Inventions on video, audio, or data mediab)
    The unrestricted storage of Works and Inventions for retrieval, transmission, and public
performancec)
    The unrestricted archiving of Works and Inventions on storage mediad)
    The unrestricted adaptation of Works and Inventions, subject to retention of moral rightse)
    Unrestricted advertising with Works and Inventions  The rights granted also include the unrestricted right to grant licenses to others. The
compensation in article 3 in this Contract includes full and sufficient consideration for the
grant of all licenses herein. So far as permitted in law, Board Member waives all moral and
personal rights in Works and Inventions, notably the right to be identified as author and the
right to revoke a license for nonexercise, and Board Member entrusts the exercise of those rights
to SAP.2.
    The German Employee Inventions Act applies as follows to any inventions and suggestions for
technical improvements that Board Member makes: Board Member will without delay disclose to
SAP his or her in-service inventions, independent inventions, and suggestions for technical
improvements and offer them for claim by SAP. Any SAP claim notice must be given not later
than four months after such disclosure. SAP has a right but not a duty to apply for patents
and design patents in Germany and elsewhere in connection with such claims. The compensation
in article 3 in this Contract includes full satisfaction of all claims for inventor
remuneration relating to in-service inventions and suggestions for technical improvements.
Board Member will be paid fair market inventor remuneration for any independent invention. If
the parties cannot agree on the amount of such inventor remuneration the matter will be
brought before the patent division of the appropriate district court in accordance with the
German Patent Act, section 143.




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-5-  3.
    Board Member will ensure that appropriate documentation is available and kept up to date and
accessible to SAP at all times for the Works and Inventions that Board Member creates or makes
during the term of this Contract and for which patent, copyright, or other protection is
available, Board Member will assign title to that documentation to SAP. During the term of
this Contract and thereafter, Board Member will help SAP to obtain patent and other protection
for such Works and Inventions in Germany and elsewhere. Board Member will complete, submit,
and sign all applications, declarations, and documents that are needed or that SAP requests so
that any patent and other protection for the Works and Inventions vests entirely in SAP, to
enable SAP to secure for itself the full and exclusive enjoyment and benefit of the Works and
Inventions and to exploit them. Except for the reimbursement of expenses that Board Member
incurs at SAPs behest, no additional compensation is payable to Board Member in respect of
performance of these collaborative duties during the term of this
Contract. In so far as Board
Member performs such collaborative duties after the end of this Contract, he or she will be
paid appropriate daily compensation and SAP will reimburse to Board Member all expenses he or
she incurs at SAPs behest. Article 7
Noncompete Undertaking
Applying During Contract Term;
Secrecy  1.
    During the term of this Contract the provisions of the German Stock Corporation Act, section
88 (1) apply. Moreover, during the term of this Contract Board Member will not hold an
interest in any company that competes with SAP or an SAP affiliate or in any company that does
a significant amount of business with SAP. The Code of Business Conduct for Employees also
applies as amended from time to time (posted on SAPNet at quick link/businessconduct).  2.
    It is a duty of Board Member to keep strictly secret all confidential matters, trade secrets
of SAP and SAPs affiliates (for example, processes, data, expertise, marketing plans,
business plans, undisclosed financial statements, budgets, licenses, prices, costs, customers,
and vendors), and the provisions of this Contract except so far as disclosure is required by
the law or ordered by the court and Board Member notifies SAP in full at the time of
disclosure. The duty of secrecy survives the end of this Contract.  3.
    It is the duty of Board Member in cases of doubt to seek clarification of the application of
the noncompete undertaking from the Supervisory Board and of the duty of secrecy from the full
Executive Board or if necessary from the Supervisory Board. Article 8
Inability to Serve; Sickness If, for health or other reasons for which he or she is not answerable, Board Member becomes unable
to perform the duties of his or her office, SAP will continue to pay monthly compensation
installments pursuant to article 3 (1) in this Contract for a period of six months. However, such
payments will not be continued beyond the end of this Contract. If in any fiscal year Board Member
is unable to perform his or her duties in this Contract for more than three months in total, the
Bonus in article 3 (2) in this Contract will be reduced pro rata temporis. So far as SAP continues
to pay compensation, Board Member hereby assigns to SAP his or her claim to recover for loss of
earnings from the person liable for that loss. Board Member undertakes to provide to SAP without
delay all the information and documents required to bring and prosecute its suit for damages.




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-6- Article 9
Leave  1.
    Board Member is entitled to 35 days paid leave based on the regular SAP five-day working
week; the entitlement is reduced pro rata temporisin respect of any incomplete year in the
term of this Contract. Board Member will plan his or her leave in consultation and agreement
with either the Board Members of the Executive Board or, in their absence, the chairperson of
the Supervisory Board, having proper regard to Board Members own needs and the interests of
SAP.  2.
    If for business or personal reasons Board Member cannot take all his or her leave entitlement
before the end of the year, the days not taken will be carried forward to the next year.  3.
    If Board Members engagement as a member of the Executive Board is ended before Board Member
can take all of his or her leave entitlement, Board Member will receive compensation in lieu
at a rate reflecting the fixed salary in article 3 (1). Article 10
Term; Termination  1.
    Subject to the appointment of Board Member to the Executive Board, this Contract commences on
January 1, 2005 and ends on expiration of Board Members Executive Board engagement, that is
to say on December 31, 2005. Any contract extending the term of this Contract will be
concluded not later than 9 months before expiration of the term of this Contract. If Board
Members engagement is extended or if Board Member is reappointed to the SAP Executive Board,
this Contract will continue in force for the duration of the extension or reappointment.  2.
    Except as provided in (5) in this article, this Contract cannot be terminated by regular
notice during its proper term. This is without prejudice to the right of either party to
exceptional termination.  3.
    Subject to the provisions in (5) in this article, if Board Members appointment as SAP
Executive Board Member is revoked, this Contract will end at the end of the calendar month
next after revocation. After revocation of the appointment, SAP is entitled to release Board
Member from duties in this Contract.  4.
    If, during the term of this Contract, Board Member becomes permanently unable to work, this
Contract will end at the end of the quarter in which the permanent inability to work was
determined. For the purposes of this Contract, permanent inability to work means permanent
inability to properly perform 50% or more of Board Members duties in this Contract.  5.
    If Board Members office as a member of the Executive Board is extinguished in consequence of
any alteration in corporate organization or structure, SAP or, if SAP is wound up, SAPs
successor is entitled to terminate this Contract with six months notice to the end of a
month.




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-7- In the same circumstances, Board Member is entitled during the eight weeks next after the
relevant event to terminate this Contract with six months notice to the end of a month. Article
13 applies. The same provisions apply in the event of a change of control. Any of the following events is a
change of control:  
    Under the German Securities Acquisition and Takeover Act an investor (not being an
investor that, at the time this Contract is concluded, alone or together with other
closely associated investors and the investors trusts, controls more than five percent of
the SAP stock) becomes obliged to take SAP over.
    The General Meeting of Shareholders approves a proposed merger with another company in
which SAP is the subsumed entity, or in which the ex-SAP shareholders control fewer than
50 percent of the company, or in which an investor becomes SAPs new principle shareholder
and would in the event that it acquired shares be obliged to take SAP over.
    The General Meeting of Shareholders approves a proposed domination agreement, profit
transfer agreement, or both, in which SAP is the dependent company. Article 11
Board Members Duties at the End of this Contract When this Contract ends, Board Member must surrender to SAP unasked all documents in Board Members
possession that concern SAP or an SAP affiliate  including but not limited to notes, memorandums,
recordings, drawings, minutes, reports, and files  at SAPs principal office, and Board Member has
no right to retain any document. The duty to surrender also extends to all things belonging to SAP
or entrusted by SAP to Board Member for the performance of Board Members duties, including but not
limited to the company car, IT equipment, discs and other media for data and programs, and Board
Members discs and other media for data and programs on which SAP programs, programs of SAP
affiliates, or data that concern SAP or an SAP affiliate are stored. If requested, Board Member
will provide a written undertaking to SAP to the effect that Board Member has completely fulfilled
the surrender duties above and has made all Board Members discs and other media for data and
programs as aforesaid available to SAP to be wiped. Article 12
Postcontractual noncompete provisions  1.
    For a year from the end of this Contract, Board Member undertakes not to work as a
self-employed person or employee or in any other way for a competitor of SAP. The competitors
of SAP AG include among others:Microsoft / Siebel / Peoplesoft / IBM / OracleFor a year from the end of this Contract, Board Member must not set up, acquire, or directly or
indirectly hold any proprietary interest in any such competitor.The noncompete provisions also apply for the benefit of SAPs affiliates.




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-8-  2.
    If in law any of these postcontractual noncompete provisions is not binding because it is too
onerous in point of time, subject matter, or geographical extent, the most onerous provision
that is binding in accordance with the German Commercial Code, section 74a (1) sentence 2
applies in its stead.  3.
    During the continuance of the postcontractual noncompete provisions Board Member will be paid
abstention compensation corresponding to 50% of Board Members final average contractual
compensation. This abstention compensation is payable at the end of each month. The abstention
compensation will be deducted from any SAP payments pursuant to article 14.  4.
    Board Member must allow other earnings to be deducted from the abstention compensation as
provided in the German Commercial Code, section 74c. Board Member undertakes to provide
information about the amount of his or her earnings at SAPs request.  5.
    At any time during the continuance of this Contract, SAP can give written notice to Board
Member waiving the postcontractual noncompete provisions. In that case, the duty to pay
abstention compensation ends six months after the notice of waiver was given.  6.
    If this Contract is terminated for just cause by and the termination is effective, SAP is
entitled within one month after such exceptional termination to give written notice to Board
Member ending the postcontractual noncompete provisions with immediate effect. In this case,
the postcontractual noncompete provisions in (1) in this article do not apply and SAP is
released from its duty in (3) in this article to pay abstention compensation.  7.
    If this Contract ends because of inability to work, SAP is entitled within one month after
written notice of the inability to work to give written notice ending the postcontractual
noncompete provisions with immediate effect. In this case, the postcontractual noncompete
provisions in (1) in this article do not apply and SAP is released from its duty in (3) in
this article to pay abstention compensation.  8.
    Board Member undertakes to pay a contractual penalty not exceeding the fixed annual salary in
the meaning of article 3 (1) in this Contract if Board Member beaches any provision in (1) in
this article. SAP will decide the contractual penalty amount at its
reasonable discretion. If
the breach continues, the contractual penalty is redefined and payable each calendar month or
part of a calendar month while Board Member is in breach. This is without prejudice to SAPs
claims for further damages. Article 13
Severance Pay  1.
    If Board Member leaves the service of SAP for one of the qualifying reasons listed below in
this (1), SAP will pay to Board Member the outstanding part of the target salary appropriately
discounted for early payment; the qualifying reasons being:  
    The appointment of Board Member as Executive Board Member is not renewed after
revocation in accordance with article 10 (3) or this Contract ends in the circumstances in
article 10 (5)  or




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-9-  
    For health reasons, Board Member is permanently unable to properly perform his or her
duties.  2.
    There is no entitlement to severance pay if  
    Board Member has not served three (3) years or more on the SAP Executive Board,or
    Board Member is answerable for his or her leaving the service of SAP, that is, there
are reasons that would have justified termination by SAP in accordance with the German
Civil Code, section 626. If the reasons do not become known until after payment, Board
Member must repay the severance pay to SAP with interest at the European Central Bank base
rate.  3.
    If Board Member is entitled to abstention compensation because of post contractual noncompete
provisions the abstention compensation will be deducted from the severance pay in article 13
(1). If Board Member is entitled to draw a pension as envisaged in Article 14 in this Contract
before the expiration of the 24 months next after Board Member actually leaves the service of
SAP, only the higher of the abstention compensation and the pension will be paid, the less
amount being deducted in full from the greater. Article 14
Retirement and Dependents Pension Plan Provision is made for Board Member by Board Members participation in the SAP Executive Board
pension plan. The amount of pension and the terms are defined by the Supervisory Board. Article 15
Miscellaneous Agreements Board Member is also entitled to an annual bonus of  1,533.88 on the existing company insurance.
SAP will bear the flat-rate tax on this. Article 16
Termination of Other Contracts of Engagement;
Time Bar
Amendments and Severability  1.
    These present terms replace the previous terms of service as Executive Board Member between
Board Member and SAP.  2.
    Not later than six months after they fall due, all rights, irrespective of legal cause,
arising out of this Contract and owed to a party herein by the other party must be claimed
from that other party in writing. So far as the law permits, rights that are not so claimed
are time-barred from the end of those six months.




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-10-  3.
    Amendments and additions to this Contract must be made in written form.  4.
    If any provision or combination of provisions in this Contract be or become wholly or partly
ineffective or unenforceable, it will not affect the effectiveness of the remaining provisions
in this Contract. The ineffective or unenforceable provision will be replaced by a provision
that is effective and enforceable and that most closely reflects the business intention
expressed in the ineffective or unenforceable provision. The same applies with respect to any
lacuna in this Contract. Walldorf, February 11, 2005
    
    Gorxheimertal, March 7, 2005/s/ HASSO PLATTNER
    
    /s/
PETER ZENCKEfor SAP the Supervisory Board
represented by its chairman
Prof. Dr. h.c. Hasso Plattner
    
    Dr. Peter Zencke