Owning Investment Property in NZ While Living in AUS

Hi there Ive been looking into what I can and can’t claim as deductions against my Australian income with my New Zealand investment property most is easy to find on the ATO website one thing I cannot find the answer to is this:

Does it matter if my mortgage is with my New Zealand bank account, Do I have to have keep my NZ property under a mortgage with my Australian bank account in order to have my investment costs deductible against my Australian income?

any help on this matter would be highly appreciated

cheers