In the ‘Transmittal Ref’ column an icon displays the state of the Transmittal. An edit icon () shows that the Transmittal is in the draft status, the tick icon () that the Transmittal has no errors. The warning icons () highlighted below show that these Transmittals do have an error, which can also be seen by the missing information in the ‘Issue By’ column:



If you hover over a Transmittal showing the error icon, a tool tip will provide further information:



In this case the Contact object that is used for the ‘Issue By’ property is no longer found. The details for the Transmittal can be checked and the issued rectified (select another ‘Issue By’ user, find out why the original Contact was deleted etc.).