Hello Paulo,
CA Panvalet V14.5 is no longer supported. The End of Support date for V14.5 was Aug 2013.
No z/OS compatibility testing or certification is done on EOS versions of products.
With that said, there are no known compatibility issues with CA Panvalet V14.6 and z/OS 2.3 and no additional maintenance required.
Recommend that you upgrade to V14.6 at your earliest opportunity to avoid any compatibility issues.
June