Member number is a value that is set to [cst_id_n] of DA6, which is an answer to DQ6 (Broker Information).
If the sponsoring sub-participant wishes to receive BO5 (Order reception and result notice) of a certain sponsored sub-participant, the sponsoring sub-participant would need to set the member number acquired from DQ6 (Broker Information).
We presume that the member number is a fixed value, but there is no guarantees from the package vendor.
There may be a situation in which the value may be changed, but the member number for all sub-participant has never been changed since the operation of J-GATE has started.
However, as mentioned above, since there is no guarantees from the package vendor, please acquire DQ6 (Broker Information) each time.
For details, please refer to“4.5.1.2 Authority, Notice Receiving and Proxy Cancellation”of“J-GATE3.0_Connectivity_Manual_Commonalities_part”.