Checkinstall for Upgrade to 16.2.3 or higher will not throw an error for Unsupported Oracle version 12.2.0.1 as expected.
STEPS TO REPRODUCE:
On a 16.1.3 and Oracle 12.2.0.1 environment, start the upgrade to version 16.2.3
Expected Results: Checkinstall to determine the version is unsupported and to throw an ERROR message.
Actual Results: Checkinstall accepts 12.2.0.1 as a supported version.
Clarity 16.2.3 and higher
This is caused by DE170546
This is under investigation