The quantity of the PO main item must be the same as for the component

What causes this issue?

The quantity of the purchase order item is not equal to the quantity of
the main rework material which was sent out to the subcontractor during
the transfer posting. In Aerospace and Defense subcontracting scenarios
this is not allowed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

To correct the error you must set the same quantity for the purchase
order item and the subcontracting component.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.