Diagnosis
You are entering a purchase transaction involving a vendor to whom aplant has been assigned. Normally, this will involve the transfer ofmaterials from one plant to another.
This process necessitates a delivery and a billing document in the SDsystem. The PO appears directly in the delivery due list of the issuingplant (vendor) and therefore does not need to be transmitted.
However, an item with the procurement form "third-party" (triangularbusiness deal) cannot appear in the delivery due list.

Procedure
An item with the procurement form "third-party" can only be orderedfrom vendors without a plant assignment.