GR of subcontracting items without issuing components

Question

Hi all
I am facing a problem regarding subcontracting. In a PO of material X  (item category L (subcontracting)) of required quantity 10, a component Y quantity 50 to make X is to be given to the vendor. The problem I am facing is that I am able to post GR of all material X without issuing any Y to the vendor. I should not be able to do this until all the component quantity (50) has been issued to the vendor. If I issue 5 Y then I should only be able to receive 1 X at max or not even 1 X. When I issue some quantity of Y it stays in subcontracting stock as seen by transaction ME2O.
How to settle this stock with subcontractor and what should be done to not be able to MIGO all 10 X until 50 Y has been issued to vendor or or to be able to do it proportionally ?
Also fine tune my concepts in this regard.
Thnx

Answer 1

Yes receiving is a physical activity not a computer activity but what I want to say is that even if X is physically received, the user should not be able to MIGO it if the components issued (subcontractor stock) is not settled.  When I MIGO the received items and enter 0 quantity for the issued component the system lets it be. Instead the system should issue an error implying  that all components have not been issued to vendor, so you can not receive X until you have issued all Y.
Try to understand my point. I know physically the vendor will send the product only when he has received all components from us but on the system, I am able to receive all X without even issuing a single Y. This is important for me because if some receiver does this without settling the subcontractor stock, it will become an odd case because the movement type 543 which does this component settling is not selectable. It is automatic for subcontracting component line item. Kindly test this scenario on your system. Make a subcontracting PO, do not issue a single component to vendor and then MIGO this PO it with 0 component quantity. I am able to post the GR which i should not be able to because the shipper has not issued a component and the receiver is able to receive on the system. I just want the system to not receive until all the components have been shipped.