Diagnosis
An error has occurred in user exit EXIT_SAPLEABC_001 duringbilling reversal for the specified document number &v1&.
You can find a more detailed description of the cause of thetermination in the message which appeared when processing of the userexit was interrupted.

System Response

Procedure
Analyze the cause of termination. Notify the programmer responsible foryour user exit.

Procedure for System Administration
To branch to the position of the call of your user exit in debugging,set a temporary breakpoint in the coding for include LEABCU01 beforethe line perform user_exit changing bcancel_data..