STEPS TO REPRODUCE:
1. Login to Classic PPM
2. Create a Custom OBS, associate it with the Custom Investment Type and add the API Attribute ID on the OBS attribute created in the object
3. Add the custom OBS in the Custom Investment Type as a column in the grid layout in Modern UX
4. Go to Classic Administration, Studio: Objects
5. Open a Custom Investment Type Object, Audit Trail tab
6. Enable audit trail on custom OBS
7.Go to New ux ->Custom imvestment grid view
8.Change the value of Custom OBS
Expected Results: Value should be changed
Actual Results: An exception occurred while trying to update the object instance" custom investment" received
Release : 15.9.1
Component : CA PPM ADD-INS (CSP,PMO,DM,EVM)
This is a defect DE61447 which is fixed in 15.9.3 .