from Rally LBAPI Documentation
The following fields are not available through the Rally Lookback API.
- Big/rich text fields (Description, Notes, etc.)
- Attachments
- Weblink fields
- LastBuild, LastRun, LastVerdict on TestCases
- Iteration or Release on Tasks
- Attributes for all unsupported entities (Workspace, Iteration, Release, Requirement), e.g. Name, EndDate, StartDate on iterations