assign_representation - assign repr only to occurrence for profile- or layer-based types #6934

src/ifcopenshell-python/ifcopenshell/api/geometry/assign_representation.py

@@ -41,6 +41,14 @@ class Usecase:
                 product_type
                 and product_type.RepresentationMaps
                 and representation.RepresentationType != "MappedRepresentation"
+                # Revit is adding a non-mapped representation to the exported profile-based types,
+                # so assigning representation to occurrence by accident was assigning it to the type.
+                # We guard from this by skipping profile and layer-based types.
+                # See 6934 for example.
+                and not (
+                    (material := ifcopenshell.util.element.get_material(product_type))
+                    and material.is_a() in ("IfcMaterialProfileSet", "IfcMaterialLayerSet")
+                )
             ):
                 product = product_type
 
@@ -60,7 +68,7 @@ class Usecase:
                     **{
                         "MappingOrigin": self.file.createIfcAxis2Placement3D(self.zero, self.z_axis, self.x_axis),
                         "MappedRepresentation": representation,
-                    }
+                    },
                 )
             )
             product.RepresentationMaps = maps