Be VERY careful if you're using Betfair for your fields in OZ. They have a variable nomenclature system for Maidens. Sometimes they tell you, sometimes they don't ..... which is a sod if you're excluding Maidens in your criteria. This isn't a problem with UK races.

They say
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We use the age abbreviation (2yo & 3yo) for all races that are purely for that age group weather it is a handicap, maiden etc. The only time this would change is if it is a Group or Listed race.>>

We use the Maiden abbreviation for mixed age and Open maiden races. We have always used the abbreviations the same way.