@JBW because i want a same functionnalty in prestashop 1.6
for example
the customer ordered some products 100€ for total products + 10€ for shipping
and when during delivery some products damaged and customer want refund like 23.5 € for all(product + shipping)
that why i need the same functionnalty in prestashop 1.6
this is important for accounting
thanks you for your remarks