Plant Specific Material Status Required Field

Hi Experts,

When I am creating a material, it says Plant specific material status field is required in MRP view. In configuration, where can you see this field is marked as required for DIEN material Type?

In OMS2 for DIEN, we have field reference as DIEN. So, when I had checked OMSR with field reference = DIEN and field selection group = 217, I am seeing that field is optional.

Can anyone please guide me where I have to check so that I can see that this field is marked as required?

Thank you.