Problem: $100 is automatically added to receipts during refunds

Summary:

Content (required):

The user is facing an issue where a $100 is been automatically added to receipts total during refund process. The user is not able to figure out when the 100 dollars is been added to the receipts.

Business Process for refund:

1) Create negative amount AR invoices

2) Create zero dollar receipts and attach negative amount AR invoice to the receipt

3) Refund the receipt

4) Make Payment for the refund

5) Check the receipt in the front end. We will see $100 added to receipt.

6) The $100 over payment is made.

Please advise on how to resolve this issue.

Version (include the version you are using, if applicable):