The minimum requirements for CMOD V9.0 are listed in here:
http://www-01.ibm.com/support/docview.wss?rs=129&uid=swg27021524#ODOSYou'll note that under "supported operating system version" it says "z/OS Version 1.13"
It should say "z/OS Version 1.13 or later"
We're running V9.0 just fine on z/OS 2.1 and z/OS 2.2. There are no current operating system dependencies for CMOD V9.0.
I'm working on getting the doc updated.
Ed