Steps to Reproduce:
Expected Results: Project is opened in to OWB
Actual Results: The error "Unable to open project XXXXX. The expected data type from the stream was different from what the stream contained" is received and the plan is not launched to OWB
Release: All Supported Releases
Component: Clarity Open Workbench
1. Delete the custom attribute and recreate, ensuring that the correct lookup data type is configured.
2. To track down the problem lookup, one thing that can help is checking for any lookups recently created or updated since the issue started happening.
3. To narrow down the issue to the project object
See KB: 141061 for tips on how to optimize use of Self Service for Clarity