Supplier Invoicing exception for credit memos

[lindasilc]

Hi expert,

I met a problem of supplier invoicing with credit memos. We created a purchase order which is Limit item type. Supplier invoice was reached and posted before with the amount 12499. Then we got 2 credit memos with the same amount, totally 12499. So I booked the credit memos, but got an exception "Missing Invoice or Credit Memo". But I cannot accept the exception, I posted and the approval task was sent to the approver. But the approver could not approve it.

(PO with Limit item type is as follows.)

(supplier invoicing with credit memos)

I want to know what triggers this exception and how I can do to make the exception disappear. Thank you very much!

Best regards

Linda Zhang

[lindasilc]

I furtherly found that before I posted the credit memos, there is only one line under the tag Items-Cost Distribution. But after I posted, the system automatically add the second line(see as follows) and the "Reference Item" shows missing.

I think that's the reason that error occurs. But I still don't know why it happens and why don't it occur before I posted the invoice. Thank you if someone can help.