The source and target Unicode Reference Device Type must not be identical

What causes this issue?

The tool for extended administration of Unicode Reference Device Types
does not modify existing URDTs. It is only able to create new URDTs.
This procedure is required to prohibit modifications of URDTs delivered
by SAP.

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

System Response

How to fix this error?

Please specify a different name for the target URDT (in customer
namespace). If you want to use the new URDT for example for an output
device which currently uses the source URDT, you have to manually assign
the new URDT to that output device.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.