Be careful - if its an IP then you want to "borrow" instead of use cash in order to maximise your tax deductibility. Unless you are planning to convert the current PPOR and upgrade to another PPOR.
I would clarify this point with your accountant.
So the accountant said when you purchase the your next IP - use the the funds sitting in your offset against the PPOR instead of borrowing the funds? Is that correct?