Correct Quantity in PO Matched Invoice

Summary:

We have a standard invoice which is matched against a PO line 1 of qty 1 and its paid fully. Users wanted to create credit memo and perform a quantity correction. But when we give the quantity as -1 we are getting an error "You cannot reduce the purchase order scheduled quantity to less than zero.Enter a value from -1 to -1 AP810198

Kindly let us know how we can perform the quantity correction in the credit memo

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