Link purchase order goods receipt to production order goods receipt

[leeuwenkoning]

Hi PP/MM experts,

I searched the forum but couldn't find an answer for configuration for the following scenario.

Scenario:

Our factory is acting as a subcontractor. We receive inventory classified as non-valuated stock. This inventory (raw material) is owned by the third-party. We then have a production order to turn the raw-material into a finished product which is then picked up by the third-party. As part of the production process a by-product/co-product is produced. This by-product we buy from the third-party. Now the problem is that there is a GR on the by-product from the production order as well as a GR on the PO to buy the byproduct from the third-party. Resulting in double inventory.

Question:

Is there a way to link the PO GR to the existing production order byproduct GR in order not to have double inventory? Or is a different type of configuration using sub-contracting PO's more applicable?

Thank you so much for helping with this scenario.