Good point. For full transparency, if you do this, you will have a subsequent vacation in a bid period that PBS will build your line based on the full value of that vacation, but after everything is pushed to DBMS the value will drop by however much of your vacation bank you have used up previously by doing this. You will still have the same vacation days, but you will not have the same vacation pay because your bank will run empty before it can pay for all of the days.