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Hello
the sub type you're trying to set is not the "Windchill business object" subtype that you see in the type manager
But the SubType attribute of the EPMDoc, managed by the resource bundle wt.epm.EPMDocSubTypeRB.
where you can specifiy the sub type of the CAD file stored in your EPMDoc. Notably for ProE. Example. Type= Part SubType = Solid
regards
Gregory