It is a built in reminder to look at your file...
For those of you that have ordered your notes, you will see that on or before the date of your sponsorship approval the officer in Mississauga did a set up in the system for your security, criminality and eligibility checks. Now, these checks weren't started in Mississauga, they will be started when the officer gets to them in Kingston, but they are initiated in the computer from Mississauga. Anyways, if you look at the notes, you will see that there is an expiry date for these checks (aka bring forward date).
Did I explain that well enough?? lol