The scenario is basically like this , There are 2 storage locations A and B in a plant. Storage Location B is under an MRP area , and has Project WBS requirements in that, There are reservations for the WBS created in storage location B, and when MRP is run in MRP area level it creates PR , when PR converted to PO , its a STO between locations with account assignment to Project.
Then the Outbound delivery is created for PO , in the PGI for OBD system fails and throws message "Message M7 076". special stock for material / wbs/ does not exist in sloc A.
Why system requires a special stock in A ?.