SAP Message XC521 - Selected postprocessing record currently being processed by user &1

Diagnosis
The system cannot process a selectedpostprocessing recordbecause this is already being processed by user &V1&.

System Response
The system attempts to process other postprocessing records that arealso to be processed.

Procedure
Check additional messages in the log to see which postprocessingrecords were processed and which ones have to be reprocessed.