Under 'Open for Time Entry' attribute in a custom investment, the Default flag cannot be unchecked.
STEPS TO REPRODUCE
1. Go to Classic PPM, Administration, Studio: Objects
2. Open a Custom Investment Object and go to Attributes
3. Find the 'Open for Time Entry' field
4. Try to change the Default from 'Checked' to 'Unchecked' and click 'Save'
Expected Results: To save the default to 'unchecked'.
Actual Results: The value is not saved and the default reverts to 'Checked'.
Release : 16.0.0
This is a defect (DE63207) and is fixed in 16.0.1