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First when you're saying categories you're talking about two different things (unless I am misunderstanding). First you have the subtype. Second you have a domain. For the purposes of this explanation I'm going to make a couple assumptions.
You only have a coded value domain (basically a dictionary) of associated values.
The domains are defined by subtype (...
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Instead of AddJoin geoprocessor tool, I do it with IDisplayRelationshipClass and now it's working fine.
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I have some (very) old code for working with subtypes and coded value domains which might be helpful; it is a very cut down section of code that was used for populating comboboxes on a form to be used instead of the attribute editor (limiting fields, appearing at the cursor) so the flow may not be entirely logical though I assure you there are some insights ...
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I agree this is not well documented. I tried the FieldInfoSet, ValueTable but eventually hit upon the GPFieldInfo object.
I worked out it was that by looking at the python snippet you get from running the Make Table View geoprocessing tool in ArcMap
If had returned:
arcpy.MakeTableView_management(in_table="C:/Scratch/mst.shp", out_view="...
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It works when I change the .Net Framework from 3.5 to 4.5.1
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