Glissando Timpani

I'm having a bit of trouble with this as I'm transcribing a score.

I'm writing a glissando for Timpani (as part of a full orchestra score) and, upon playback, not only do I get the notes I need but it plays all of the other notes in between the two notes that I've clearly specified. PDF and MSCZ files are attached for your reference.

Is there any way I can silence the notes in between the two required notes?

Thanks in advance!