How To Fix WP634 - Purchase order generation for material &1, as no open PO can be found

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 634

• Message text: Purchase order generation for material &1, as no open PO can be found

What causes this issue?

The system could not find any open purchase order items for material
&V1& using the existing information on goods receipt items.

System Response

The system automatically creates a purchase order for material &V1& for
this goods receipt item and post the goods receipt, creating a
reference to this purchase order item.

Error message extract from SAP system. Copyright SAP SE.