When you enter an item and you want to give credit for that specific product, at the moment you enter the quantity you put a negative number first and then you enter the amount for the credit. Tap on “done” to finish the credit task.

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You will see that the status shows as credit, if you tap on the status it will let you select the different criteria’s for that item, you can insert it as Credit, Damaged, Expired, Missing or Returned.