Even though the COBOL data names are not case sensitive, you need to specify the exact case in the specification xml files. For example, if in the COBOL data source, the data name is called MY-Data, in the Service specification xml the nativeTypeName attribute must be set to nativeTypeid="MY-Data". If you don't specify the exact case, the data name will not be found and the first available level 01 data name will be used by default.