Environment: 
iVend 6.6 Patch 7915.
Problem Description: 
Discounts issues on POS.
Scenario:
Discount issues still persist even after upgrading to patch 7915.
Solution:
1) Check the product and the discounts applied on the product-on-Product screen.
2) Check the retail profile discounts applied on that product.
3) Checked the discount profile of the person here we found it was showing 5 % whereas on product we have mentioned 100%
so, we have changed it to 100 %.
Resolution/Work Around: 
We have changed the discount percentage for the Store Supervisor profile according to the product discount and then restarted then POS terminal Sale discount issue has been resolved.