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I'm trying to replicate the below left join in a GI by adding the additional filter at the end of the join. Is there any way to achieve this in a GI? I was trying to add a field outright in the relation and was hoping I could just add a value in the child field section but it complains with any variation I try. I tried another way doing it in the conditions but that didn't work out. Thanks in advance for any help on this.
LEFT JOIN FSGeoZone ON FSGeoZonePostalCode.GeoZoneID=FSGeoZone.GeoZoneID AND FSGeoZone.AreaType = 200

I'm assuming you tried "=200" for the Child Field?
What about a Parameter that is hardcoded to true, then put all your logic on the left-hand side and have it evaluate to true/false, then select the Parameter on the right-hand side?
