The following information is located in CA Support Online at the following link:
https://support.ca.com/phpdocs/0/MSPSaccount/COMPAT/zos_compat.HTML
You would note in the section detailing z/OS levels:
*Operating Systems:
*=======================================================================
* OPSYS | VERSION/RELEASE | CA-DADS PLUS FOR CICS VER/REL/GLVL
*=======================================================================
* Z/OS | 2.1 | r4/all service packs + QO91208
* | 1.13 | r4/all service packs + QO91208
* | 1.12 | r4/all service packs + QO91208
* | 1.11 | r4/all service packs + QO91208
* | 1.10 | r4/all service packs + QO91208
* | 1.9 | r4/all service packs + QO91208
This is showing the requirements for the last several levels of z/OS.
By all service packs on would need to be on the 0507 genlevel. Also from LI24117:
*------------------------------------------------------------------------
* Release | Genlevel | Service Pack | GA Date | Drop Support Date
* ------------------------------------------------------------------------
* 4.0 | 0507 | 2 | Jul 2005 | Not announced
* 4.0 | 0310 | 1 | Oct 2003 | Not announced
* 4.0 | 0208 | 0 | Oct 2002 | Not announced
* ------------------------------------------------------------------------
By being on the 0507 genlevel and having applied QO91208, you would be certified for z/OS level 2.1.