CA Filesave RCS is no longer supported by CA. Please note the End of Life Announcement:
In the letter it states:
"This means CA Filesave RCS Automated Recoverywill no longer be enhanced and that maintenance and technical support will be discontinued beginning September 30, 2015. However, CA Technologies will honor any existing contractual requirements to sustain support on this product that may exist between you and CA Technologies."
That said, the last release of CA Filesave RCS was 4.0. I'm not seeing a V2.3 out there within the last 10 years at least. Are you sure you are not at 4.0? You are still using CA FileSave RCS?
z/OS 2.2 came out after CA Filesave RCS went into End-of-Life status, so it was not certified at the z/OS level.