Confirmation-Related Goods Receipt 
Confirmation-Related Goods Receipt
Use
When entering a goods receipt against a purchase order, you can have the system suggest the confirmed quantities instead of the complete order quantity.
Prerequisites
If you wish to post the goods receipt with reference to vendor confirmations, set the GR assignment indicator for the desired confirmation category in Customizing for Purchasing. SAP recommends that you always set this indicator for the last category of confirmation you expect to receive in each case.
In item 1 of a PO, 200 tons of steel were ordered for delivery on May 1st. The vendor notifies you that 50 tons will be delivered on May 1st, and 150 tons on May 3rd.
When you post a GR against the PO, the system will generate one default quantity line containing 50 tons, and one with 150 tons.
The GR quantities then relate to individual inbound deliveries and can also be deleted per inbound delivery. If a goods receipt of 150 tons is posted against an inbound delivery of 150 tons, the inbound delivery is cancelled out (the quantity is reduced to zero, i.e. completely offset). The inbound delivery of 50 tons remains open.
When you enter a goods receipt against the purchase order, the system suggests the order quantity of 200 tons of Steel 1 as the GR quantity.
The inbound deliveries are offset (reduced or cancelled out) according to the confirmation date.
If you post a GR of 150 tons, the first inbound delivery is cancelled out with 50 tons, and the second one partially offset with 100 tons. The second inbound delivery is thus left with an open quantity of 50 pcs.