Another thing to consider is to use a client script that runs on change of the planned start/end date or configuration item. In the client script, call ChangeCheckConflicts.check() not too sure if this works or on the proper syntax.
Yes, I agree with Darius. I would suggest to have a onSubmit client script to check if the submit to be allowed. This will give a good user experience than accepting certain values and not changing it at server side.
Thanks
Antin
PS: Hope this helps. Mark the answer as correct/helpful based on impact.
