Hello
If you are using MRP to generate planned orders, you can create a quota arrangement where this production version is the only source of supply with 100% of the share. This way, MRP will always select this production version for the planned orders.
If you are facing problems with the quota arrangement, you can take a look on point 7 of the following blog:
MRP: Vendor is not selected and general problems on source determination
BR
Caetano