A purchase requisition is created when an external material (non-stock component) or an external activity (externally processed operation) has to be procured during production order execution. The buyer responsible for the purchase requisition processes it and one or more purchase orders are created for it. This is displayed in the production order via a system status.
If changes relating to the ordered materials or activities should occur in the production order (changed requirements quantity, changed requirements date), the system automatically changes the purchase requisition. The buyer has to manually change the purchase orders that have already been created.
With SAP Business Workflow, the buyer can be informed when one or more purchase orders have already been created and when one of the following production orders changes has been executed:
The buyer receives a work item that lists all the relevant changes relating to the external material and external activity. The buyer can view the affected purchase requisitions and the purchase orders that have already been created. In addition to this, he or she can edit the purchase orders and create new purchase orders.
For more information, refer to the component BC - Basis by choosing Business Management -> SAP Business Workflow -> Workflow Scenarios in Applications -> Production Planning and Control -> Purchase Order Changes (PP-SFC).