Prevent users from entering dates that put other tasks in the past


Our project managers are responsible for creating new projects in our schedule. They enter a install start date and contract date. The dates for all the other tasks are formula driven from the install date. The image below shows our engineering tasks. Those 3 projects where entered within the past two days. All of our tasks where supposed to be completed last month or in December. It's impossible for us to do this unless time travel is real. Is there anyway to prevent them from entering a install date that doesn't allow any of the tasks to be completed after today's date. A warning or something to notify them that the install start date must be moved up to allow for engineering thru shipping. Any help would be appreciated.



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