How to apply a Supplier Coupon during Costing

Go through the receiving and costing process as normal. 

When you get to the payable screen

1. Edit the non dis-countable amount to be the invoice total-the coupon.

2. Leave the distribution lines with the totals from costing.

3. Add a distribution line for the amount of the coupon as a negative amount.  Add Coupon to the comment.