The question the Qld Office of State Revenue asks is:
Will all applicants occupy the home as their principal place of residence for a continuous period of at least six months, commencing within one year after completion* of the eligible transaction?
It is a straight forward matter to determine whether a property is your PPR.
It is not a straight forward matter to determine that you occupied the PPR.
i.e.
Many jobs/self employed require a degree of travel - defence forces deployed overseas, mining industry employees, seasonal fruit pickers, traveling salesmen, professional athletes, ship's crew, locum relief staff etc, etc.
Many of these people can legitimately be away from home for months at a time, so that over a 6 mth period, they may spend no more than 3 weekends at home - or no time at all in the case of soldiers deployed to Afghanistan or Timor.
If someone decides to go on a 3 mth overseas holiday, that drags out to 6mths, your PPR is still your PPR. You don't have an alternative PPR.