Value assignment alternative & table & used in object dependencies

What causes this issue?

You want to change the interface for table access. A characteristic
must be converted from a data field to a key field, or the other way
round, for value assignment alternative &V1&.

System Response

The system checks whether the table is used in released constraints or
actions. If it is, no changes are possible.
Use of the table in preconditions or selection conditions is not
relevant to changes to key fields and data fields.

How to fix this error?

If you set the status of the dependencies (constraints or actions) to
<ZH>Locked</>, the value assignment alternative can be processed.
When you next maintain the dependencies, you must include the changes
to table access.

Error message extract from SAP system. Copyright SAP SE.