Can't edit in WaveLab

Well, I’ve been able to edit a Cubase file in WaveLab, but only if the track has only one event, I mean only one and unique file.

For example, if I record a mix of the project I can edit this file in WaveLab and triggering the Cubase update icon actually updates the file in Cubase.

Unfortunately, there is still a small issue. If I delete in WaveLab one part of the file, let’s say a couple of seconds at the end of the file, when updating in Cubase all the editions are properly kept except these couple of deleted seconds that still remains in the Cubase track and must be deleted by hand.

Has anyone this same issue?