Individual reservations not changed due to existing cancellation schema

What causes this issue?

A change is only possible if there is no cancellation schema.

System Response

The change is not made.

How to fix this error?

Cancel the reservations and create new reservations.

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.