Credit on a Sales Order, How to Enter
To indicate a credit on a Customer Sales Order, highlight the Other Charges field and enter a minus (-), it will give you a “Warning” message. Just click OK.
Then enter the amount of the credit in the Other Charges field. Enter “Store Credit” into the Other Charges Comments field. The reason for the warning is to alert the salesperson to make sure the sales order does not go negative. Going negative will cause a problem and it’s the salesperson’s responsibility to avoid that scenario.