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O2U-00203:

Type to be declared must be an object type or a named collection type
Cause: You have asked OTT to generate code for a type it does not support. When generating Java code, OTT will only generate code for object types. When generating C declarations, OTT will only generate declarations for object types and named collection types.
Action: You are probably asking OTT to declare a built-in type, or, if you are generating Java code, a named collection type. Do not ask OTT to generate a declaration for this type.