Diagnosis
The ALE distribution inbox can only process one IDoc at a time. Massprocessing BOM IDocs is not allowed. This applies for material BOM(BOMMAT message type), document structure (BOMDOC), order BOM (BOMORD),plant assignment (PALMAT) and material variant (STTMAT) distribution.

System Response
IDoc inbound processing is cancelled. The IDoc remains in the inboxwith status 51 (error during posting).

Procedure
Ensure that the ALE inbox has finished processing one IDoc before thenext one begins.