<field groups="product.group_uos" name="product_uos_qty"/>
<field groups="product.group_uos" name="product_uos"/>
<field name="product_uom"
-- on_change="product_uom_change(parent.pricelist_id,product_id,product_uom_qty,product_uom,product_uos_qty,product_uos,name,parent.partner_id, 'lang' in context and context['lang'], False, parent.date_order)"/>
++ on_change="product_uom_change(parent.pricelist_id,product_id,product_uom_qty,product_uom,product_uos_qty,product_uos,name,parent.partner_id, 'lang' in context and context['lang'], False, parent.date_order)" domain="[('category_id','=', product_id.uom_id.category_id.id)]"/>
<field
name="product_packaging"
context="partner_id=parent.partner_id,quantity=product_uom_qty,pricelist=parent.pricelist_id,shop=parent.shop_id,uom=product_uom"