Diagnosis
You did not selected the "Direct delivery active" field and did notcorrectly maintain the three purchasing document item category fields.

System Response
INCLUDE ISR_STOP

Procedure
If you did not select the "Direct delivery active" indicator, you musteither maintain the following three fields completely or not at all:
Purchasing document item category "Direct"
Purchasing document item category "Single purchase order"
Purchasing document item category "Stock transfer"