FACILITY EMS
200,OPTER,Error encountered during message output.
201,NOMSG,No error messages pending output.
300,UNSET,Status not set in call to EMS_REP (improper use of EMS_REP).
301,BADOK,Status set to SAI__OK in call to EMS_REP (improper use of EMS_REP).
302,NSTER,Error in nested calls to EMS_BEGIN and EMS_END (improper use of EMS).
303,BDKEY,Invalid keyword will be ignored (improper use of EMS_TUNE).
304,BTUNE,Conflicting actions (improper use of EMS_TUNE).
305,NOENV,Error encountered reading environment variable EMS_TUNE.
400,EROVF,Error stack overflow (EMS fault).
401,CXOVF,Context stack overflow (EMS fault).
