The IfcOpenShell API now supports automatic primitive casting for editing properties. See #1943.

src/blenderbim/blenderbim/bim/module/pset/operator.py

@@ -148,7 +148,6 @@ class EnablePsetEditing(bpy.types.Operator):
             new.is_null = data.get(prop_template.Name, None) is None
             new.is_optional = True
             new.data_type = data_type
-            new.enum_data_type = prop_template.PrimaryMeasureType
 
             if data_type == "string":
                 new.string_value = "" if new.is_null else data[prop_template.Name]
@@ -161,7 +160,7 @@ class EnablePsetEditing(bpy.types.Operator):
             elif data_type == "enum":
                 new.enum_items = json.dumps(enum_items)
                 if data.get(prop_template.Name):
-                    new.enum_value = data[prop_template.Name]
+                    new.enum_value = str(data[prop_template.Name])
 
     def load_from_pset_data(self, pset_data):
         for prop_id in pset_data["Properties"]: