What does the error "RMS:Blocked for [scrip id] B bse_cm CNC broker- ZERODHA Remarks: Security is in GSM block type: ALL" mean?

RMS:Blocked for [scrip id] B bse_cm CNC broker- ZERODHA Remarks: Security is in GSM block type: ALL

The stock is under GSM [due to which the order was rejected] & can be only traded on exchange stipulated days i.e Mondays, either once a week or once a month depending on the GSM stage.

For more information about Graded Surveillance Measures refer BSE.