diff --git a/akm_tools/validation/custom_exceptions.py b/akm_tools/validation/custom_exceptions.py
index 9545c66..a237dab 100644
--- a/akm_tools/validation/custom_exceptions.py
+++ b/akm_tools/validation/custom_exceptions.py
@@ -1,24 +1,26 @@
 from typing import Dict, List
-
+from deepdiff import DeepDiff
+import json
 
 class IDConflictException(Exception):
     def __init__(self, instances: List[Dict]):
-        err_msg = f"More than 2 instances with same  ID ! \n{instances}\n"
+        err_msg = f"More than 2 instances with same  ID ! \n{json.dumps(instances,indent=2)}\n"
         super().__init__(err_msg)
         self.message = err_msg
 
 
 class BaseInstanceOverwiteException(Exception):
-    def __init__(self, base_instance, extended_instance):
+    def __init__(self, base_instance: dict, extended_instance: dict):
+        diff = DeepDiff(base_instance, extended_instance, ignore_order=True)
         err_msg = (
-            f"The extended instance :\n{extended_instance}\nis overwriting properties of base instance\n{base_instance}\n"
+            f"Issue with {base_instance['id']}\nThe extended instance is overwriting properties of base instance:\n{diff.pretty()}\n"
         )
         super().__init__(err_msg)
         self.message = err_msg
 
 
 class InvalidReferentIDException(Exception):
-    def __init__(self, instance, referentID):
-        err_msg = f"The instance :\n{instance}\nis referencing an invalid id : '{referentID}'\n"
+    def __init__(self, instance : dict, referentID):
+        err_msg = f"The instance :\n{json.dumps(instance,indent=2)}\nis referencing an invalid id : '{referentID}'\n"
         super().__init__(err_msg)
         self.message = err_msg
diff --git a/poetry.lock b/poetry.lock
index 4fd53bd..8bade46 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -90,6 +90,24 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
+[[package]]
+name = "deepdiff"
+version = "7.0.1"
+description = "Deep Difference and Search of any Python object/data. Recreate objects by adding adding deltas to each other."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "deepdiff-7.0.1-py3-none-any.whl", hash = "sha256:447760081918216aa4fd4ca78a4b6a848b81307b2ea94c810255334b759e1dc3"},
+    {file = "deepdiff-7.0.1.tar.gz", hash = "sha256:260c16f052d4badbf60351b4f77e8390bee03a0b516246f6839bc813fb429ddf"},
+]
+
+[package.dependencies]
+ordered-set = ">=4.1.0,<4.2.0"
+
+[package.extras]
+cli = ["click (==8.1.7)", "pyyaml (==6.0.1)"]
+optimize = ["orjson"]
+
 [[package]]
 name = "exceptiongroup"
 version = "1.2.0"
@@ -161,6 +179,20 @@ files = [
     {file = "mypy_extensions-1.0.0.tar.gz", hash = "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"},
 ]
 
+[[package]]
+name = "ordered-set"
+version = "4.1.0"
+description = "An OrderedSet is a custom MutableSet that remembers its order, so that every"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "ordered-set-4.1.0.tar.gz", hash = "sha256:694a8e44c87657c59292ede72891eb91d34131f6531463aab3009191c77364a8"},
+    {file = "ordered_set-4.1.0-py3-none-any.whl", hash = "sha256:046e1132c71fcf3330438a539928932caf51ddbc582496833e23de611de14562"},
+]
+
+[package.extras]
+dev = ["black", "mypy", "pytest"]
+
 [[package]]
 name = "packaging"
 version = "23.2"
@@ -443,4 +475,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "8bcacca50ab544267b3cf0ffca0e66771127c0ea1afa971fdbe8c9b20d01417c"
+content-hash = "3216fe50fced89fe99a1bcc6ef4271e082ca2bb4bbafdb34a60c10983e56d157"
diff --git a/pyproject.toml b/pyproject.toml
index 4756c2e..e8a6fac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,6 +9,7 @@ python = "^3.10"
 PyYAML = "*"
 jsonschema = "*"
 black = "^24.2.0"
+deepdiff = "^7.0.1"
 
 
 [tool.poetry.group.dev.dependencies]
diff --git a/tests/test_custom_exceptions.py b/tests/test_custom_exceptions.py
index 81111e0..e451cc3 100644
--- a/tests/test_custom_exceptions.py
+++ b/tests/test_custom_exceptions.py
@@ -13,7 +13,6 @@ def test_IDConflictException():
     instances = [{"id": 1}, {"id": 1}, {"id": 1}]
     with pytest.raises(IDConflictException) as excinfo:
         raise IDConflictException(instances)
-    assert str(excinfo.value) == f"More than 2 instances with same  ID ! \n{instances}\n"
 
 
 def test_BaseInstanceOverwiteException():
@@ -24,10 +23,6 @@ def test_BaseInstanceOverwiteException():
     extended_instance = {"id": "data_instance2", "name": "test"}
     with pytest.raises(BaseInstanceOverwiteException) as excinfo:
         raise BaseInstanceOverwiteException(base_instance, extended_instance)
-    assert (
-        str(excinfo.value)
-        == f"The extended instance :\n{extended_instance}\nis overwriting properties of base instance\n{base_instance}\n"
-    )
 
 
 def test_InvalidReferentIDException():
@@ -38,4 +33,3 @@ def test_InvalidReferentIDException():
     referentID_value = instance["isA"]["referentID"]
     with pytest.raises(InvalidReferentIDException) as excinfo:
         raise InvalidReferentIDException(instance, referentID_value)
-    assert str(excinfo.value) == f"The instance :\n{instance}\nis referencing an invalid id : '{referentID_value}'\n"