diff --git a/case.jsonld b/case.jsonld
index cb8d917..14aa48c 100644
--- a/case.jsonld
+++ b/case.jsonld
@@ -774,8 +774,6 @@
                 "@type": "xsd:boolean",
                 "@value": true
             },
-            "olo:length": null,
-            "olo:slot": null,
             "uco-core:hasFacet": [
                 {
                     "@id": "kb:cc127ee8-9166-51c3-a531-d3fe4e6ab024",
@@ -801,8 +799,6 @@
                 "@type": "xsd:boolean",
                 "@value": true
             },
-            "olo:length": null,
-            "olo:slot": null,
             "uco-core:hasFacet": [
                 {
                     "@id": "kb:e5a13089-b18d-5a7d-9f02-6ceaa2dc616a",
diff --git a/case_mapping/uco/observable.py b/case_mapping/uco/observable.py
index 8372e9c..fd7216a 100644
--- a/case_mapping/uco/observable.py
+++ b/case_mapping/uco/observable.py
@@ -1629,14 +1629,13 @@ def __init__(self, name=None, facets=None):
 
 
 class Message(ObservableObject):
-    def __init__(self, *args: Any, indexed_items=None, **kwargs: Any) -> None:
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
         """
         A message is a discrete unit of electronic communication intended by the source for consumption by some
         recipient or group of recipients. [based on https://en.wikipedia.org/wiki/Message]
         """
         super().__init__(*args, **kwargs)
         self["@type"] = "uco-observable:Message"
-        self.append_indexed_items(indexed_items)
 
 
 class DiskPartitionFacet(Facet):