SAP Note 28727 - Incor.acct.assig. with comp. for sales order stock

Symptom:

If a component for sales order stock is allocated in a network with allocation to sales order item and WBS elemement, item category 'E', instead of item category 'D' is set in the reservation/purchase requisition. This can cause subsequent errors in purchasing or in materials planning/inventory management.

Cause and prerequisites
Solution
1. Check table TCOKT using transaction SE17:
The last entry (TCOKT-Acc.Cat_005) should be 'D'. Since you will be able to maintain this data field only as of Release 3.0C, the field must be set here using ABAP.
2. Change Include LCNWBTOP (see below.).
3. Change function module CN_WB_CHECK_SD_ORDER_FOR_NETW (see below).
4. Change Includes LCOMDU02 (see below.).