How do you perform a Goods Receipt?

Use Transaction MIGO. Enter the Header Data, select the Movement Type, Enter the PO Number, select the PO items to be copied, and then post the document.

Now, How can you post a Goods Receipt if the PO number is not known?
If you selected PO Number Not Known in Transaction MIGO, you can specify search criteria for the POs on the initial screen. The system then displays a list of purchase orders. Select and copy the required PO items.