I know that feature but Payza don't permit uploaded funds to withdraw via BTC, you have to receive payments from outside, those payments you can withdraw via BTC. Anyway no problem I fixed the problem in LBC. But one thing is sure, this forum has become extremely slow.
You can use funds loaded by Bank Account (either Wire or Transfer) to buy Bitcoin through Payza, it is only Credit Card funds that have this restriction and that has more to do with the transaction being treated as a cash advance. For example, you would not be able to add funds by credit card and then withdraw to your bank account by wire or transfer either because of this.