Predecessor & of basic type & is not released

What causes this issue?

You want to create basic type &v2& as a successor of basic type &v1&.
However, basic type &v1& is not yet released.

System Response

Basic type &v2& cannot be released.

How to fix this error?

Check whether you want to make further changes to &v1&.
If this is not the case, you can release &v1&.

Error message extract from SAP system. Copyright SAP SE.