Table &1 can only be transported generically. See long text

What causes this issue?

The table &V1& can only be transported generically, because its key
contains a non-character field.

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?

Check whether the entries for table &V1& can be transported into the
target system without risk.
Remove the table entries from the transport request, if necessary.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.