The default value for & can now be changed

What causes this issue?

You want to change the default value calculated by the system. To do
so, you have unlocked the field so that data can be entered.

System Response

The system checks all of your changes.

How to fix this error?

Enter a date. If necessary, you can retrieve the default value
calculated by the system.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.