Yes you guys are right BUT.
Changing the attack range is where this issue is about. Not about changing the acquistion range.
I don't know if you guys already understood me but isn't it an option to per example set the unit's atk range to 3000, then set his Acq range to like 400. Then when you want to increase his "atk range" just set his acq range to 600. Because attack range cant be higher then the acq range so ingame it will be set to the same amount.
hmm, sorry teuncreemers that I wasnt replying to your question because it thought you should be speaking of it on another thread. Anyways, having a higher range than an acquisition range is possible I think(I am on a computer without Warcraft), if you have acquired a target for 400 acquisition range and your range is 3000 range yet continuously kept sight on it you can shoot it in that 3000 range without affecting anything
If this answer is not what you're talking about inform me again. ^_^
If AttackRange > AcquistionRange then
set AttackRange = AcquistionRange
endif
Summarize...
Nop, you can't. You will need a whole new level with value lowered, but when you need the attack range increased once again, you will need a new level of upgrade again.