Most sprints priorities will change a little bit as time goes on and it will be appropriate to remove a ticket that was added previously. Likewise, if a sprint is over subscribed some tickets may roll over into the next sprint.
When this happens, they will often be put in the parking lot in Aha to be re-planned. It would be nice if this move to the parking lot resulted in an automatic move to the Icebox in Pivotal right now -- currently, team leaders have to do both tasks consecutively.
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