Basis table & occurs more than once

What causes this issue?

A table appears several times in the list of base tables of the lock
object. This is not allowed.

System Response

The action was cancelled.

How to fix this error?

Ensure in the maintenance transaction of the ABAP/4 Dictionary that
no table appears more than once as base table of the lock object.

Error message extract from SAP system. Copyright SAP SE.