Unit canceled from the queue of a building

[OranBar]

Hello,

I have a question regarding how to get a specific event from the replay.
In particular, I'm trying to compute the supply block time. 

I would like to know if it is possible, using your s2protocol library, to know when a player cancels a building unit (e.g. A marine is produced and then canceled from a Barracks before spawning).

I have not been able to find any data or documentation regarding this event, although,  since your client correctly shows the unit disappearing from the building's queue, I assume it is stored somewhere in the replay.

Any help would be greatly appreciated
Thanks