Check Fire in Combined Arms Scheduling

In fire missions conducted from the Combined Arms Scheduler the check fire option should drop the rounds to be impacted until the check fire option is unchecked. For example if a fire mission is scheduled for 60s with the rate of fire as 2, there will be rounds impacting at 0s, 30s, and 60s. If the check fire option is checked at 20s and unchecked at 40s, the round which needs to impact at 30s will be dropped and the 3rd round which is due at 60s will fire at the scheduled time.