Unless you are flying on, a commercial aircraft, "variations" should ALWAYS be "authorized" PERIOD, DOT. Hell, even on some TDYs where you do fly commercial variations may still occur, and therefore need to be "authorized" in advanced.
It seriously makes me angry how inept the Finance career field as a whole seems to be.
TWO MONTHS to pay out CZTE/HFP
Over-paying due to an error in the "system" and refusing to take the money back all at once, instead resorting to deducting it from my pay for months on end
Inability to answer any (A N Y) questions about how their ominous "system" works
This is just a small example of the ass-hattery I've seen with these people. I seriously do not leave/hang up with finance without having a rank/name of who I dealt with, because it invariably gets screwed up. At least then I can ask for that specific person and hold them personally accountable (assuming they aren't "on leave" or "attending training", as per their coworkers).
I've said it before (on here, and in a finance office), but if Ops did our jobs the way that Finance did theirs, there would be more smoldering holes in the ground than tails on the ramp.