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How to Hosting On Linked Elemen useing CreateLinkReference

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yichenbj
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How to Hosting On Linked Elemen useing CreateLinkReference

I'm tring to palce a FireAlarmDevices(NewFamilyInstance) host  on Ceiling in Linked Model

I use "CreateLinkReference" Method,because The remarks in the help file state:

 "The reference that is returned can be used to create a family instance on a face in an RVT link."

and I use NewFamilyInstance(Reference, XYZ, XYZ, FamilySymbol) to create a family instance.

 

but i found this error "Reference direction is parallel to face normal at insertion point" .

to create a family instance.

notice if this ceiling at the same project no error found so i think that the problem is not the direction of the family instance

 

I would be very grateful for an example showing how I can attach a face hosted family to a Revit Linked file (a ceiling grid in particular). 

 

 

Thanks a lot.

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