Transformation to be applied exists for source and target

What causes this issue?

In the data flow, you have connected a source object and a target object
using a link, for which there is already a persistent transformation in
the system.

System Response

Instead of creating a non-persistent transformation, the existing
transformation is added to the data flow.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.