IFC export problem - missing material on structural foundation isolated

[Redesco_sb]

It seems that when i try to export on ifc a structural foundation isolated like rectangular pad the structural material set on revit don't show on the ifc. Do you know how to solve this?

I've tried everything but it seems the problem is general on every structural foundation isolated family.

[galan_mauricio]

Could you solve this issue? I have the same issue with some walls and I do not know why.

[Redesco_sb]

I've solved the export problem material for structural foundation adding the parameter ifcexportas and assigning ifcfooting on it. 

[galan_mauricio]

I will try with another type, because is a wall above grade, and let you know. Thank you for your answer!