BOMMISMATCH, XXX Byte Order Marker found when YYY character set specified.
Run Time Error: A Byte Order Marker (BOM) for character set XXX was found at the beginning of a file specified as containing data in character set YYY.
Action: Specify the proper character set when opening the file. For UTF-16 data, specifying CHSET="UTF-16" will use the BOM to determine whether the data is Little Endian or Big Endian. If no BOM is found, GT.M assumes Big Endian.