Not sure how netwealth works but with Westpac broking they work on a system like this: you can't place a buy order worth more than something like $15,000 without having paid a deposit in advance first. The alternative is to have chess registered holdings that hasn't been sold equal to the value that you're putting your buy order in for.
In this way you can buy however much you have in your portfolio on credit.
I doubt netwealth would've not implemented a safeguard such as this ... christopher, I'd suggest you must've had more than $25,000 worth of registered (ie paid for) holdings in your portfolio.
