PPSR disputes may arise where a Dealership Registers an interest on a vehicle that they were not entitled to register a Security Interest over.
They may do this in cases where they did not register a Purchase Monies Security Interest (PMSI) at the time they sold the vehicle on terms. Then, later when they did not get paid as expected, they register a Security Interest. By this time the vehicle may be in the hands of another dealer or private buyer who bought the vehicle and checked clear title with a PPSR certificate.
The process that needs to be followed is detailed here in the document Registrar’s Practice Statement No. 4 - Amendment Demand Process
PPSR Legislation
The Legislation that deals with this process is linked below, and I suggest that you browse through the relevant sections in Part 5.6 .
http://www.comlaw.gov.au/Details/C2011C00950