Changes to & have an effect on multiple extensions

What causes this issue?

The changes to the assigned basic type for extension &v1& affect the
predecessors and successors of extension &v1&.
Consider this if you change the assigned basic type.

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?

Error message extract from SAP system. Copyright SAP SE.