diff --git a/kgforge/core/archetypes/mapping.py b/kgforge/core/archetypes/mapping.py
index f78a66cb..11aba9a0 100644
--- a/kgforge/core/archetypes/mapping.py
+++ b/kgforge/core/archetypes/mapping.py
@@ -50,11 +50,6 @@ def __repr__(self) -> str:
     def __str__(self):
         return self._normalize_rules(self.rules)
 
-    def __eq__(self, other: object) -> bool:
-        # FIXME To properly work the loading of rules should normalize them. DKE-184.
-        # return eq_class(self, other)
-        raise NotImplementedError
-
     @classmethod
     def load(cls, source: str, mapping_type: MappingType = None):
         # source: Union[str, FilePath, URL].
diff --git a/kgforge/specializations/mappings/dictionaries.py b/kgforge/specializations/mappings/dictionaries.py
index b08cff19..27e43881 100644
--- a/kgforge/specializations/mappings/dictionaries.py
+++ b/kgforge/specializations/mappings/dictionaries.py
@@ -18,10 +18,16 @@
 
 from kgforge.core.archetypes.mapping import Mapping
 from kgforge.core.commons.attributes import sort_attrs
+from kgforge.core.commons.execution import not_supported
 
 
 class DictionaryMapping(Mapping):
 
+    def __eq__(self, other: object) -> bool:
+        # FIXME To properly work the loading of rules should normalize them. DKE-184.
+        # return eq_class(self, other)
+        raise not_supported()
+
     @staticmethod
     def _load_rules(mapping: str) -> OrderedDict:
         return hjson.loads(mapping)
diff --git a/kgforge/specializations/stores/demo_store.py b/kgforge/specializations/stores/demo_store.py
index e62f8522..692bf36c 100644
--- a/kgforge/specializations/stores/demo_store.py
+++ b/kgforge/specializations/stores/demo_store.py
@@ -37,13 +37,6 @@
 class DemoStore(Store):
     """An example to show how to implement a Store and to demonstrate how it is used."""
 
-    def __init__(self, endpoint: Optional[str] = None, bucket: Optional[str] = None,
-                 token: Optional[str] = None, versioned_id_template: Optional[str] = None,
-                 file_resource_mapping: Optional[str] = None,
-                 model_context: Optional[Context] = None) -> None:
-        super().__init__(endpoint, bucket, token, versioned_id_template, file_resource_mapping,
-                         model_context)
-
     @property
     def mapping(self) -> Type[Mapping]:
         """Mapping class to load file_resource_mapping."""