The best solution is, by all of the sets of drawings to ensure that it is a date, and in order to prevent it, all of the subcontractor is, that you are working with the latest plan. Set dating plan will eliminate the confusion about what is the latest. Date of the last set of blue prints in mind your construction contract, all of the people on the site, all of the subcontractors, confirm their plans in order to ensure that in their set for that date plan it should be posted in the ground rules to allow that.
