UAU242 - never heard of that one before. The only criteria I have ever heard of is 'factored' hours. There is a similar thread elsewhere, but the numbers used are as follows for UK contracts:
SFO- >2500 factored hours and full ATPL
(0.8 x your total hours for short haul jet FO)
(0.9x your total hours for short jet CPT)
(0.6x your total hours for long haul FO)
(0.7 x total hours for long haul CPT)
(0.7 x your total hours for Airline turbine FO)
(0.8 x your total hours for airline turbine CPT)
FO- >1250 factored hours
Upgrade to FO after a minimum of 24 months operating as FO.