Pro-rata refund calculation

This example shows a calculation of the pro-rata refund amount for an order including delivery cost, handling fee and order discount, that is fully returned in one part:

This example shows a calculation of the pro-rata refund amounts for an order including delivery cost, handling fee and order discount, that is fully returned in multiple parts:

The SRO calculations are based on the following principles:

• Quantities are given negative values. 
• Row discounts keep their positive values.
• Order discounts are given negative values. 
• Delivery costs and fees are given negative values.
• Unit and campaign prices keep their positive values

Payment information rows will remain positive for backward compatibility reasons.