diff --git a/src/bonsai/bonsai/tool/loader.py b/src/bonsai/bonsai/tool/loader.py
index ceb5cfd688..461bed1d4d 100644
--- a/src/bonsai/bonsai/tool/loader.py
+++ b/src/bonsai/bonsai/tool/loader.py
@@ -926,9 +926,32 @@ class Loader(bonsai.core.tool.Loader):
         return mesh
 
     @classmethod
-    def setup_active_bsdd_classification(cls):
+    def setup_active_bsdd_classification(cls) -> None:
         ifc_file = tool.Ifc.get()
-        attr_name = "Specification" if ifc_file.schema == "IFC4X3" else "Location"
+        schema = ifc_file.schema
+
+        # In IFC2X3 IfcClassification doesn't have an attribute for uri.
+        if schema == "IFC2X3":
+            classifications = [c for c in ifc_file.by_type("IfcClassification") if c.Name]
+            if not classifications:
+                return
+            pattern = r"^https://identifier\.buildingsmart\.org/uri/([a-zA-Z0-9]+)/([a-zA-Z0-9]+)/([0-9]+\.[0-9]+)"
+
+            # No inverse attribute in IFC2X3...
+            for ref in ifc_file.by_type("IfcClassificationReference"):
+                if (
+                    not (uri := ref.Location)
+                    or not uri.startswith("https://identifier.buildingsmart.org/uri/")
+                    or not (pattern_match := re.match(pattern, uri))
+                    or not (classification := ref.ReferencedSource)
+                    or classification not in classifications
+                    or not classification.is_a("IfcClassification")
+                ):
+                    continue
+                tool.Bsdd.set_active_bsdd(classification.Name, pattern_match.group(0))
+            return
+
+        attr_name = "Specification" if schema == "IFC4X3" else "Location"
         bsdd_classification, uri, name = None, None, None
         for c in ifc_file.by_type("IfcClassification"):
             if (
diff --git a/src/bonsai/test/tool/test_loader.py b/src/bonsai/test/tool/test_loader.py
index ba0d9a10b8..74e4839074 100644
--- a/src/bonsai/test/tool/test_loader.py
+++ b/src/bonsai/test/tool/test_loader.py
@@ -19,6 +19,7 @@
 import bpy
 import bmesh
 import ifcopenshell
+import ifcopenshell.util.schema
 import bonsai.core.tool
 import bonsai.tool as tool
 from test.bim.bootstrap import NewFile
@@ -513,15 +514,32 @@ class TestLoadingIndexedMap(NewFile):
 
 
 class TestSetupActiveBsddClassification(NewFile):
-    def test_run(self):
+    def run_test(self, schema: ifcopenshell.util.schema.IFC_SCHEMA) -> None:
+        schema_ = "IFC4X3_ADD2" if schema == "IFC4X3" else schema
+        bpy.context.scene.BIMProjectProperties.export_schema = schema_
         bpy.ops.bim.create_project()
         ifc_file = tool.Ifc.get()
         name = "CCI Construction"
         uri = "https://identifier.buildingsmart.org/uri/molio/cciconstruction/1.0"
-        ifc_file.create_entity("IfcClassification", Name=name, Location=uri)
+        if schema == "IFC2X3":
+            classification = ifc_file.create_entity("IfcClassification", Name=name)
+            ifc_file.create_entity("IfcClassificationReference", Location=uri, ReferencedSource=classification)
+        else:
+            attr_name = "Specification" if schema == "IFC4X3" else "Location"
+            classification = ifc_file.create_entity("IfcClassification", Name=name)
+            setattr(classification, attr_name, uri)
         filepath = "test/files/temp/test.ifc"
         ifc_file.write(filepath)
         bpy.ops.bim.load_project(filepath=filepath)
         props = bpy.context.scene.BIMBSDDProperties
         assert props.active_domain == name
         assert props.active_uri == uri
+
+    def test_set_load_and_set_active_bsdd_ifc2x3(self):
+        self.run_test("IFC2X3")
+
+    def test_set_load_and_set_active_bsdd_ifc4(self):
+        self.run_test("IFC4")
+
+    def test_set_load_and_set_active_bsdd_ifc4x3(self):
+        self.run_test("IFC4X3")