I found the problemā¦ all Floor Plan disciplines are under the same Type Properties, except Structural Plans. They are theyāre own type. In Type Properties for Structural Plan, there was no callout Tag selected. Once selected, the tag in the callout displays. The callout tag can be selected from two ways: in a Structural Plan > Edit Type / Type Properties > Graphics > Callout Tag ; or in the Parent View, select the Callout and change Reference Other View to a Structural Plan > de-select the Callout > then select the Callout > Edit Type / Type Properties > Graphics > Callout Tag.
Once a Callout Tag has been selected for Structural Plan, it cannot be deleted, or left blank. There has to be an entry.
This appears to be an overlooked issue on Autodeskās part. They never entered a Callout Tag for Structural Plan.
This is how the default Revit OOTB template is setup. Iāve never encountered it before, so I had never set a callout tag for Structural Plans in my template.
This is another example of Autodesk's failure to provide comprehensive and complete development of Revit's user interface that has cost me literally several hours of my billable time to troubleshoot. I need to understand these types of issues, and not use yet another work-around. No one here has been able to offer a solution, and my re-seller that provides tech support, ASTI, could not provide a solution either (although they were on the right path). This lack of cohesiveness with Revit's functionality & user interface is infuriating and unacceptable. I continually hope that Autodesk will some day address all of Revit's flaws, faults, and short comings, but it's highly unlikely.