2513889 - Unposted Supplier Invoice as Sum of item amounts does not match original item amount

You post a supplier invoice in the Supplier Invoicing work center but the document appears as Unposted Source Document in the General Ledger due to the error "Sum of item amounts does not match original item amount".

SAP Business ByDesign

1. Go to the General Ledger work center and access Source Documents subview within Closing Cockpit view.
2. Find the source document XXX(ID of the supplier invoice) and you can see the error Message in the Details section. 

You have set up Security retention/installments in the supplier invoice as well as assigned down payment requests. Check the Invoice General tab and here the Payment Information sub-tab.

This combination is not supported as the clearing of the Installment splits with the assigned down payments cannot be reliably performed.

The only way to resolve this issue is by cancelling this supplier invoice. 
The cancellation document will also appear as unposted source document. You can then mark both documents as irrelevant (see below).

Then, create a new supplier invoice, either with down payment request reference(s) or installments but not both.

  2772501 - How to Cancel Irrelevant Unposted Source Documents

supplier invoice, unposted source document, Sum of item amounts does not match original item amount, installment, down payment , KBA , SRD-FIN-GL , General Ledger , Product Enhancement