You can specify valid field names with the ADD, REMOVE, and SET commands.

ACKR_SQ ACK_LM BDT_WAITS BLKS_REQ BLKS_SENT BUFF_DESCR CABLE_STATUS CIR_STATE CL_EXPECTED_VOTES CL_MEMBERS CL_QDVOTES CL_QUORUM CL_VOTES CMDS_QUEUED CNX_STATE CON_STATE COUNTER_OWNER CR_WAITS CSID DGI_MAP DGS_DSCRD DGS_FREE DGS_RCVD DGS_SENT DG_OVRHD_SIZE DG_SIZE DIR_WT ERT_COUNT ERT_MAX EXPECTED_VOTES FORMED FORM_CIRCS FREE_BUFF HW_TYPE HW_VERS INCARNATION INCN_TIME INIT_REC KB_MAPPED KB_RCVD KB_SENT LAST_TRANSITION LB_STATUS LD_CLASS LOC_CONID LOC_PROC_NAME LOG_MAP LPORT_NAME LP_LD_CLASS LP_PRIORITY LP_STATUS LP_TYPE MAX_PORT MEMSEQ MGT_PRIORITY MIN_REC MIN_SEND MSGS_FREE MSGS_RCVD MSGS_SENT MSG_HDR_SIZE MSG_SIZE NAME NODE NUM_CIRCUITS NUM_CONNECTIONS NUM_ERRORS OPEN_CIRCS PEND_REC POOL_WAITERS PORT_NUM PRIORITY PROTOCOL PRT_MAP QDVOTES QD_NAME QF_ACTIVE QF_SAME QF_VOTE QF_WATCHER QUORUM RCVD_SQ RECEIVE RECNXINTERVAL REM_CONID REM_PROC_NAME REM_STATE RPORT_NUM RP_FUNCTIONS RP_OWNER RP_REVISION RP_TYPE RSPS_QUEUED SCS_STATE SCS_WAITERS SEND SEND_SQ SOFTWARE STATUS SW_VERS SYS_ID TRANSITION_TIME UNACKED VOTES WARMCDRPS