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O2U-00206:

Some characters in a type name were not legal identifier characters
Cause: One or more characters in the name of a user-define type could not be translated to a character that can appear in a C or C++ identifier, such as a letter, an underscore, or a digit. The characters that could not be translated were replaced with underscores.
Action: Specify an explicit translation for the type name in the INTYPE file, or just use the translated type name with added underscores.