Queued package distributions can be cancelled. To cancel all queued distributions open Distribution status tab of the Asset item page and select Cancel queued installations from Tasks > Package distribution menu.
To cancel a single distribution open the “Distribution status – Webpage Dialog” by clicking the distribution’s status column and the “Cancel Distribution” button.
Package distributions with "waiting" status can be also paused and resumed from the Asset configuration item's Events > Distribution status tab if you don't want to cancel them entirely.
See also