diff --git a/databricksx12/edi.py b/databricksx12/edi.py
index b11887f..08b231b 100644
--- a/databricksx12/edi.py
+++ b/databricksx12/edi.py
@@ -235,7 +235,7 @@ def summary(self):
     #  @returns a python dictionary representing metadata found in EDI/FunctionalGroup/Transaction classes
     #
     @staticmethod
-    def class_metadata(cls_obj, exclude=['data', 'raw_data']):
+    def class_metadata(cls_obj, exclude=['data', 'raw_data', 'isa']):
         return {str(cls_obj.__class__.__name__ + "." + attr): getattr(cls_obj, attr) for attr in dir(cls_obj) if not callable(getattr(cls_obj, attr)) and not attr.startswith("__") and attr not in exclude}
 
     #