FI/CO interface: Line item entered several times

What causes this issue?

The following document information was transferred several times:
Reference document "&v1&"
Reference organization "&v2&"
Item number "&v3&" .

System Response

The document information keys must be clear.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.