SAP Message VLSC201 - No inbound delivery item with external item number &1 found

Diagnosis
The inbound delivery item with the following criteria could not befound:
External item number: ,, &V1&
Purchase order: ,, &V2&
Purchase order item: ,, &V3&

System Response
The subcontracting components cannot be saved. The inbound deliverycannot be created.

Procedure
Contact your system administrator.

Procedure for System Administration
Contact SAP Support.