We are a having problem exporting Revit Model to Tekla, we understand this is revit forum (not tekla) but it seems problem associated with revit model whoever understands the nature of issue kindly reply with some guidance.

When we try to export the Revit Model to Tekla, it skips some steps to feed in structural info for our proposed model. i.e., it does not asks about SHS-Square Hollow Section column (which it does ask when we export existing model) even though we have those columns on the proposed design. So it does not export it as it should to Tekla. Is there any visibility issue or structural ? 

Any Help and advise will be much appreciate

Revit 2017