How To Fix FQ798 - Inadmissable field change in user exit &

FQ798 - Overview

• Message type: E = Error

• Message class: FQ - Payment Requests and Payment Program

• Message number: 798

• Message text: Inadmissable field change in user exit &

What causes this issue?

In the Userexit &V1& a document header field was changed, that does not
belong to the SAP Standards field. These fields must not be changed in
the Userexit.

System Response

Further processing is not possible.

How to fix this error?

Please check the Usersexits characteristic &V1&

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FQ798 - Inadmissable field change in user exit & ?

  The SAP error message FQ798, which states "Inadmissible field change in user exit &," typically occurs in the context of financial transactions, particularly when there are inconsistencies or unauthorized changes being made to fields that are not allowed to be modified during certain processes. This error is often related to user exits or enhancements that are implemented in the SAP system.
  
  Cause:
  
  Field Modification: The error usually arises when a user exit or enhancement attempts to change a field that is not permitted to be modified at that point in the transaction process. This can happen if the field is part of a validation or if it is locked during certain processing stages.
  Incorrect Logic in User Exit: If the logic implemented in the user exit is not aligned with the standard SAP processing rules, it can lead to this error.
  Data Consistency Issues: The system may detect that changing the field would lead