Hi, annotations are not part of a data cell. A data cell only contains "data". DataCellEx contains annotations. E.g.
Dim cellText As String = cell.DataCellEx.DataCellAnnotation
However, this all looks like potential overkill for something that could easily be achieved using Confirmation Rules. Adding a Confirmation step after the Workspace step in the workflow (provided this is the case) would add this process step for the users to complete their workflow. I know, having this directly as part of the dashboard is more "convenient". However, save data event handlers should only be used where absolutely necessary due to their impact on performance. That is why in such a case I tend to recommend to explore other options. On top of the Confirmation way, one can also add dynamic cells in the CV that immediately display an error message in a CV cell based on the entered values that the users can see and act upon as needed. The confirmation rule would mirror those and block the users from proceeding should they forget about it.