Time period was changed; existing participation bookings remain unchanged

What causes this issue?

The validity dates of the course in the curriculum have been changed.
However, there are already bookings for the course in the old validity
period.

System Response

The system will apply the new validity dates. All new bookings will be
created witihin the new validity period, but the existing bookings will
remain in the old validity period.

How to fix this error?

Check whether you really want to change the validity period even though
it will have no effect on existing bookings.

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.