Our accountant showed me a couple of credit memos that she entered with value in discount field. They appeared as negative values on summary, and she then posted. Now, when we run AR, they appear as positive. Is there any way to delete or adjust a credit memo once it has posted?
99.999% sure the answer is no, and you’ll have to make another CM.
I suggest doing two separate CM’s. The first to undo the error of the initial CM, and the second to do what the initial CM was attempting to do. You could do it in one, but two makes it easier to understand what went down.