Reducing Purchase Order Commitments to Zero 
Use
The system reduces purchase order commitments to zero according to goods or invoice receipts and converts them into actual costs. As the quantity (down to zero) determines the reduction of a purchase order commitment to zero, you need quantity-based commitment management.
If values for purchase orders, goods to be delivered, and invoices are to determine the reduction (to zero) of a purchase order commitment, then you need value-based commitment management. To set up value-based commitment management per unit of measurement, choose General Settings ®
Check Unit of Measurement in Customizing.
Unlike purchase orders for materials, those for services are monitored on the basis of value, not quantity.
Features
When the Commitment is Reduced
The goods receipt indicator in the purchase order determines when the commitment is reduced and actual costs are set up (that is, in the detail screen for the purchase order item).
Reducing Commitments to Zero
You can reduce the purchase order commitment proportionally. To do this, you need to enter a goods receipt or invoice receipt for a purchase order.
The system reduces purchase order commitments completely: