Inheritance templates &1 and &2 have overlapping data areas

What causes this issue?

You attempted to create an inheritance relationship to a target
specification or source specification for which another inheritance
relationship already exists. The data in the newly assigned inheritance
template &V2& and the data in the previous inheritance template &V1&
overlap.

System Response

The inheritance relationship cannot be created.

How to fix this error?

You can either:
Use a different inheritance template
Change the inheritance template so that the data does not overlap

Error message extract from SAP system. Copyright SAP SE.