The beam positioning line Difference

I use Rhino.Inside.Revit to transfer my beams to Revit.But I find my positioning line in Rhino is the beams geometric centerline.But when I draw a beam in Revit,the beam’s positioningline is the top centerline.This is my twice time meeting this problem.Is a Bug ?

Actually in revit it is not always Top but it is whatever you used the previous time. RhinoInside always creates the beam on the origin (or center) so if you want to have it on top I would suggest to use “Element Parameter” and modify “z Justification” value:

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Thanks for your help