Error "Could not assign security for collaborator" is thrown if Roadmap Author tries to share roadmap with user who already have Roadmap - View instance security right.
Steps To Reproduce:
1. Create new roadmap
2. Add instance right "Roadmap - View" to a user
3. Navigate inside the Roadmap -> Properties tab
4. Click on "Share" button on roadmap and add user
Expected: User gets added successfully
Actual: An error occurs with message "Could not assign security for collaborator"
Clarity 16.2.3, 16.3.0, 16.3.1, 16.3.2
DE171837
Resolved in Clarity 16.3.3