RLS

The RLS system initialization parameter specifies whether CICS is to support VSAM record-level sharing (RLS).

RLS={NO|YES}

Valid values are as follows:

NO: RLS support is not required in this CICS region. Files whose definitions specify RLSACCESS(YES) will fail to open, with an error indicating that RLS access is not supported. You should not specify RLS=NO if you have files that you want to open in RLS access mode (including the CSD).
YES: RLS support is required in this CICS region. During initialization, CICS automatically registers with an SMSVSAM control ACB to enable RLS access to files opened with RLSACCESS(YES).