Data from Business Add-In ME_PROCESS_PO_CUST not adopted

What causes this issue?

An endless loop occurred during the processing of the Business Add-In
<DS:TRAN.SE18>ME_PROCESS_PO_CUST</>. The system terminated the
processing.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

Check whether standard fields are changed in the implementation of the
Business Add-In <DS:TRAN.SE19>ME_PROCESS_PO_CUST</>.
Changes to standard fields that are part of the Include structure
MEPOITEM_TECH and/or MEPOSCHEDULE_TECH are generally not allowed. In
addition, no field values that are not changeable through the field
settings in the Enjoy transactions can be changed in the BAdI. Correct
the implementation accordingly.

Error message extract from SAP system. Copyright SAP SE.