FI/CO interface: Line item entered several times

Hi Experts,

We have a scenario File --> Idoc. At the idoc level, invoices and credit notes are created. When the customer is loading data everything is moving fine.

But for one scenario, customer is able to load the invoice correctly which has multiple credit notes, is throwing an error in status 51 as "FI/CO interface: Line item entered several times"

Message no. RW014

Diagnosis

The following document information was transferred several times:

• Reference document "0"
• Reference organization "0002309592"
• Item number "0000000007"                                             .

System Response

The document information keys must be clear.

Procedure

This is a system error of the application which was called up.

Can someone help me on this please?

Thanks in Advance,

Vishal.DS