[ADD] add_multi_line on byproducts

app_mrp_bom_product_multi_add/views/mrp_bom_views.xml

@@ -15,6 +15,16 @@
                         }"/>
                     </control>
                 </xpath>
+                <xpath expr="//field[@name='byproduct_ids']/tree/field[1]" position="before">
+                    <control>
+                        <create string="Add a line"/>
+                        <create string="Multi add line" context="{
+                        'pro_multi_add': True,
+                        'pro_res_model': 'product.product',
+                        'pro_res_field': 'product_id',
+                        }"/>
+                    </control>
+                </xpath>
             </field>
         </record>
     </data>