At my workplace, twice a year, I'm asked to sign a particular form that my working hours are within acceptable limits for the organization. About a year ago, higher-ups started requiring receipt of this form several months earlier than had formerly been the case. In fact, we're being asked to sign and submit the form on a date earlier than the working hours in question are known -- or at least my department is doing so before I go on vacation, during which my working hours will be set.
So the administrative staff are asking me to sign two variants of the same form, one for each of two different cases in which I could be, depending on how my working hours later get set, and promising to destroy the irrelevant copy once my situation is known at a later date. Again, they say they need to do this to meet the submission date requirement of the next level up, which occurs while I'm out of the office on vacation every time.
How should I respond to this request?