Rules have changed mate. Irrespective of experience and professional qualification you must do a board approved course (prescribed by the tax practitioners board). To become a registered BAS agent its a very easy course (say compared to CA) but time consuming (really basic of GST, FBT, WET, PAYG W AND PAYGI and record keeping).
I will do my RTA but you now need to do an introductory tax law unit (which is what Im doing now) and advance tax law unit (my CA tax module satisfies the advanced one) and also a board approved course in commercial law (this one I have to do and gonna take some time)