What causes this issue?

Program RFFDZA00 was exited without sucessfully selecting payment
advice.

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?

The program execution was exited prior to its fully processing advice
selection and payment request generation. Typically the BACK command is
executed prior to fully processing a selection.
Please restart the selection transaction and choose execute to complete
the advice selection process.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.