Selection specifications and transfer target are identical

What causes this issue?

The creation of the transfer document would create a copy of the
document to be transferred. However, copies are not permitted.

System Response

The transfer is not executed.

How to fix this error?

Check the selection specifications and the transfer target.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.