Contract for controller & is broken

What causes this issue?

Contract for controller &v1& is broken.
The metadata of the controller at the time of creating the enhancement
is different from the current (active) metadata state. This could cause
data conflicts.

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?

Using the compare operation, start the version comparison between the
contract and the current version in order to get an overview of the
differences.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.