IBM SC34-5764-01 - Manual (Page 416)

-527 Redundant specification for option
-528 Value for option not specified
-529 Value specified for option which should not have a value
-530 Value specified for option is not numeric
-531 Invalid value
-532 Value specified is too long
-533 Value specified is too short
-534 Value not specified
-535 Variable table overflow
-536 Number of variables exceeds variable table limit
-537 Argument must be a variable
-538 Variable does not exist
-539 Invalid variable name
-540 Master system trace flag must be on for tracing
-541 Parsing error
-542 Generic name is invalid
-543 Missing right parenthesis
-544 Ambiguous value/keyword
-545 RIDFLD must be fullword variable
-546 RIDFLd must be variable
-547 Invalid GETVAR return code
-548 Internal GETVAR error
-549 Bad PUTVAR return code
-550 PUTVAR failed
-551 Unable to obtain storage
-552 Exec CICS command table not found
Return Codes
394 CICS TS for VSE/ESA: REXX Guide