fix errors getting layer assignments in ifc2x3 #4330

src/blenderbim/blenderbim/tool/geometry.py

@@ -745,7 +745,13 @@ class Geometry(blenderbim.core.tool.Geometry):
         consider_inverses = []
         styled_item, colour, texture, layer = None, None, None, None
         [consider_inverses.append(styled_item := t) for t in representation_item.StyledByItem]
-        [consider_inverses.append(layer := t) for t in representation_item.LayerAssignment]
+        # IFC2X3 is using LayerAssignments
+        for t in (
+            representation_item.LayerAssignment
+            if hasattr(representation_item, "LayerAssignment")
+            else representation_item.LayerAssignments
+        ):
+            consider_inverses.append(layer := t)
         # IfcTessellatedFaceSet
         [consider_inverses.append(colour := t) for t in getattr(representation_item, "HasColours", [])]
         [consider_inverses.append(texture := t) for t in getattr(representation_item, "HasTextures", [])]

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

@@ -47,7 +47,13 @@ class Usecase:
         for subelement in self.file.traverse(self.settings["representation"]):
             if subelement.is_a("IfcRepresentationItem"):
                 [styled_items.add(s) for s in subelement.StyledByItem or []]
-                [presentation_layer_assignments.add(s) for s in subelement.LayerAssignment]
+                # IFC2X3 is using LayerAssignments
+                for s in (
+                    subelement.LayerAssignment
+                    if hasattr(subelement, "LayerAssignment")
+                    else subelement.LayerAssignments
+                ):
+                    presentation_layer_assignments.add(s)
                 # IfcTessellatedFaceSet inverses
                 [textures.add(t) for t in getattr(subelement, "HasTextures", []) or []]
                 [colours.add(t) for t in getattr(subelement, "HasColours", []) or []]