There are several CICS message suppression parameters within CA SYSVIEW.
One way to suppress the GSVC201E error messages is by using the following parameter from the CICSOPTS/SVWCOPTS parmlib member:
Please note, the parmlib member is dependent upon your release of SYSVIEW. Releases 14.2 and up use the SVWCOPTS parmlib member instead of CICSOPTS. Additionally, please ensure it is placed before the the )EOF that is in the member. If the ABEND-NOTIFICATION parm is after the )EOF, it will be ignored.
You can issue the HELP GSVC201E in SYSVIEW for this information.
Another method to supress the messages is by tweaking the ABENDS CICS Threshold definitions on the CTHRESH command display or in the CTHRESH parmlib member. To prevent these messages from being sent to CICS logs, the Log field of the definition will need set to NO.