Diagnosis
When sub-items are created for a line item in the purchase order dueto material interchangeability in the TPOP process, the main line itemis marked as statistical. Hence any follow on processing on the mainitem is not allowed.

System Response
The system does not allow processing of the main item and raises theerror message.

Procedure
Check the confirmation IDOC sent by the supplier and see if the sent POitem number is correct.
The IDOC should contain the sub item number of the PO.