Auditing is enabled on objects automatically post upgrade from version 15.9.3 to 16.0.3. This is observed with custom OBS type attributes specifically.
Steps to Reproduce:
Expected Results: Auditing should be disabled as prior to upgrade audit was disabled
Actual Results: Auditing is enabled by default for the custom OBS attributes on project object
Release : 16.0.3
If the auditing for OBS type attributes is enabled and disabled before upgrade.
Engineering have reviewed the DE67238 and observed that the enabling of auditing is happening only when upgrading from 15.9.3.2.12 (15.9.3 Patch 2) to 16.0.0.890. Issue does not exists in the upgrade of 15.9.3 to 16.0.3 if there is no audit enablement for the attributes before upgrade.
This is not reproducible when the upgrade is done from 16.1.0 to latest release ( 16.1.0 to 16.1.1 latest). So you will not see this issue in your next upgrades.
Workaround:
Remove the attributes from the audit which was added with upgrade.