If you are playing Omaha High Low, it is important that you raise in late position with an Ace Deuce Suited.  There are a couple reasons for this, but the main reason would be:

You should generally be playing a tight game in Omaha High Low.  So if you are doing this, when you get the opportunity to pretty much guarantee doubling the pot, there is no better hand to do this than an A2XX suited!  Make the best of your opportunities!

Raising in fixed limit omaha high/low is practically useless.  The only time you should be raising in a fixed limit OH8 game, is if there are plus 4 limpers and you have an A2XX with a suited ace (or better).  The purpose of this raise only to build the pot, to ensure that you are getting a payoff when/if you hit.  Another hand that is ok to do this, is an all high hand (99XX, with XX being 2 cards 10 and higher), and again – the purpose is for pay off and results.

The biggest mistake made in Omaha High Low poker is, players want to play more hands than necessary.  The temptation of having 4 cards to choose from can always entice a poker player to just play more, when in all reality – more means less here!  If you are starting out playing Omaha High Low, keep this simple rule for yourself.  PLAY ONLY A2, A3, 23 and hands with 99 or better.  You should be playing between 12 and 16% of your hands here.  This will help you in maintaining a tight image at the poker table, along with ensuring you are not chasing hands that are not the best option for you to chase!