Be sure for your one records and better interest to keep tracking of the date in which you were asked to falsify your report and any additional details in case you ever have to come back on this incident.
I personally would never falsify any report. Working in Law/Legal areas, there are many times that I would have been better off to do so but it just isn't the right thing to do, what happens, happens and it is our duty and job to report the facts and nothing else.