esuperfund trade limit

Hello,
I have set a fund with esuper and finally got my money out of my old fund and into the V2 plus account.
I have been trying to place a buy order in but comsec wont let me as it says i have to have a % of the total as a deposit.
I rang up comsec and they said there is a limit on none chess sponsored account of $7500. I tried a less amount but still has same message. I was unaware of this issue. I wish to trade with parcels will over the $7500 limt. Anybody else have this same problem? And how do they avoid it?
Cheers
Hally2710