Selection of all relationships switched on or off

What causes this issue?

You have chosen Edit->Select on/off->Relationships. On this and the
following screens all relationships will now be displayed selected or
unselected.

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?

No action is required. This is just for your information.

Error message extract from SAP system. Copyright SAP SE.