Background: A supplier has issued a single credit note covering all of the most recent invoice, which was unpaid, and part of the previous one, which was already paid in full.
If I try to credit the most recent invoice using the correct values I get the error “The credit note amount cannot exceed the remaining balance (£VALUE).”, which is to be expected.
If however I try to create a generic CN as per the instructions, by creating a purchase and entering negative values, the reference number correctly updates to prefix CN but upon saving I get the error message “The value of the purchase must be greater than zero.”