When a PPSR registration has been amended or discharged, this creates a registration event. An ordinal search allows you to compare two registration events.
You will need both PPSR registration numbers. These are unique 15-digit numbers generated when a security interest is registered. A PPSR registration number is not a vehicle registration number.
You will also need the start time, end time or the change number of each registration, depending on the search you wish to conduct.