Target element component &1.&2 defined more than once

What causes this issue?

An error occurred that prevents further processing. This is most likely
due to a Customizing error.
The following information should enable a specialist to locate the
problem so that it can be resolved more quickly.
The target element <ZH>&V1&</> should be created by component during
container transformation.
However, component <ZH>&V2&</> of this target element is defined
several times. This is obviously an error.

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?

Contact your system administrator specifying the error concerned.

Error message extract from SAP system. Copyright SAP SE.