On the subcontractors’ side, a requirement for the purchase order component material is shown for the normal or special stock.

The last operation of the refurbishment order decides if the refurbishment order is MRP-relevant. If the last operation is external (subcontracting), then the refurbishment order header is not MRP-relevant, only the subcontracting purchase order that is used for the goods receipt. If the last operation is internal, both receipt elements are relevant. Therefore, the subcontracting purchase order is always active for MRP.

All reservations created by the new processes are always MRP-relevant, this is important especially for the partial subcontracting scenarios, when internal operations are represented with a pair of 261 and 262 movements if followed later by a subcontracting step.

If there is an internal operation following an external operation, the 261 reservation of the internal operation compensates the subcontracting purchase order reservation, so both are MRP-relevant.

In the case of complete subcontracting (no internal operations), the MRP elements (reservation and order header receipt created by the refurbishment order) are not relevant for MRP. Instead, the subcontracting purchase order must be MRP-relevant only in this case to avoid double counting of receipts when the subcontracting purchase requisition/order is created.

For the planned material change, only the order header receipt or subcontracting purchase order is counted as replenishment in MRP for the new material number, not the component with an MPI, for example, MPI ‘X’.

For planned material changes for orders with internal operations and transfer postings, the following happens: