User &1 is maintaining version types. Field groups cannot be maintained.

What causes this issue?

User &v1& maintains the version types and consequently locks the
assignement of the fields of field packages to the field groups.

System Response

The system checks whether the version types are maintained.

How to fix this error?

Try the assignement later or contact user &v1& directly.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.