Question-and-Answer Resource for the Building Energy Modeling Community
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Like @Kyle Benne mentioned, two-stage transcritical systems are supported but you have to be careful about editing the osm manually.
I bet you are adding the Refrigeration:TranscriticalSystem like it is in the EnergyPlus IDD, however, the OpenStudio Model IDD is subtlety different for this object. Some of the fields can be inferred during Forward Translation from OSM -> IDF so they are not in the OSM.
Since you mentioned it comes with an error in field 3 or 4, I bet you have the field 'System Type' as 'TwoStage', which is A2 in the EnergyPlus IDD. This is one of the fields that is inferred during forward translation thus is not in the OSM IDD. Another difference between the OSM IDD and E+ IDD is the objects and terminology used for the Refrigerated CaseAndWalkInLists.
Your best bet to manually construct the OSM is to look at the OSM IDD and make sure you conform to its specifications since this is what is used when loading an OSM.
Look here for OS:Refrigeration:TranscriticalSystem in OpenStudio IDD
But I would really try to use either the ruby API directly or a measure to construct this type of system until it is supported in the GUI.
