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How to fix the mistake of not giving a discount on a Work Order that has already posted to Invoice and where vendor taxes have been already paid.
Manually calculate the amount owed for the discount, e.g. $23.69, and enter it onto a New Invoice - as a negative amount.
Be sure to enter the Category as Work Order.
Click on Enter a Payment button and select Refund – Store Credit or whichever method you will use to refund the customer.
The current Invoice zeroes out because of the refund.
The current Invoice also generates a negative tax amount which will be deducted from your next sale report (for the month in which the new Invoice falls).