Diagnosis
If a short dump occurred it is probable that the TRFC to or from thesource system was incorrect.

Further analysis:
To determine what happened, you must check the source system ALE outboxand compare it with the Warehouse ALE inbox.
You can check the source system ALE outbox using the wizard or thetabstrip "All IDOcs" in the Monitor.
In the "All IDOcs" tabstrip, also set the key figure "IDOcs in thesource system" and "IDocs in the Warehouse", and select the "Refresh"function.