Movement 545 on project stock - Subcontracting co-product
In a subcontracting purchase order item, I am trying to receive co-products, which are not directly the material ordered, but will be recieved in the same time from the supplier.
To do so, I declare those co-product materials as items with negative quantity in the main product BOM. That way, they appear as negative components in the purchase order item.
When I make the GR for this purchase order item (using ADSUBCON transaction), I get an error message M7226 saying that "Entry 545 X X R _ _ P is missing in customizing". We are actually using project stock, but I am a bit surprised, as I only used standard features in this scenario, and I wonder what would be the simpler way to recieve those co-products with the purchase order item. It doesn't seem safe to change standard customizing for movement types...
Any help will be appreciated.