How To Fix UC039 - The sender record produces duplicate keys

SAP Error Message - Details

• Message type: E = Error

• Message class: UC - FI/CO Data transfer: errors during transfer

• Message number: 039

• Message text: The sender record produces duplicate keys

What causes this issue?

During the data transfer, at least two data records with the same key
fields were sent.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Ensure that, during the data transfer, only data records with different
keys are sent, or, in the sender structure maintenance, allow 'double
keys' for the sender structure.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.