Set up approved vendors for products with variants in D365 Supply Chain Management

Hi everyone,

I would like to set up approved vendors for released product variants. I set it up on the relased product but I do not get any message when I raise a PO to a vendor which is not in the approved list. (although the approved vendor check method on the item model group is set to "not allowed").

Would you know if the approved vendor check method can work for product with variants?