Hi Mounir,
Your question header "Customer Item" still open in FBL1N. Is it a typo or this is vendor and also a customer?
For your issue, run FBL1N for all items. Filter the clearing document column for the payment document that you posted. it will show you the vendor line items and payment document that you paid. If the issue invoice is not there meaning that the suspicious invoice is not selected for the payment that why it is open.
Thanks.
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