My fourth Workflow suggestion has been submitted to Microsoft Connect for you to vote on.
The fields available to the Workflow email notifications are very limited, and there is no front end way of making them available. I’d like to see functionality added to Workflow Maintenance to flag fields as available to the notification emails; this would include fields from any tables available to the workflow type, including from an additional table joined to the workflow type through the enhanced Query Editor.
You can vote for this suggestion here.
Read original post MS Connect Suggestion: Allow Additional Fields to be Avalable to Workflow Notification Emails at azurecurve|Ramblings of a Dynamics GP Consultant