When a Data Sharing group exists with several members, what must be defined in the RC/Secure for Db2 for z/OS (RCS) SECURE hlq.CDBAPARM member.
The recommendation is to have entries for all the individual data sharing members and also the group attach name.
RC/Secure is currently not doing any special processing for Data Sharing Group's, it is simply checking that the SSID entered
in the main product menu is also present inside the SECURE member.