[IMP] m2m_tags on additional product tags

product_variant_description_sale/views/product_product.xml

@@ -21,6 +21,9 @@
     <field name="model">product.product</field>
     <field name="inherit_id" ref="product.product_normal_form_view" />
     <field name="arch" type="xml">
+      <field name="additional_product_tag_ids" position="attributes">
+        <attribute name="widget">many2many_tags</attribute>
+      </field>
       <group name="description" position="attributes">
         <attribute name="string">Sale descriptions</attribute>
       </group>