in "Products" (model product_template) I have inherited and added a custom field "brand_id" of type "Many2many"
in my custom "OrderItems" I had a field "brand_id" as "Many2one",
here user selects a "product" and for "brand" I want to 'filter' and show only "brands" which are associated to the selected "product" in "Products"
please help how to filter it.
regards