diff --git a/antarest/study/storage/variantstudy/model/command/create_binding_constraint.py b/antarest/study/storage/variantstudy/model/command/create_binding_constraint.py
index 74a4fdaf1c..495b48e557 100644
--- a/antarest/study/storage/variantstudy/model/command/create_binding_constraint.py
+++ b/antarest/study/storage/variantstudy/model/command/create_binding_constraint.py
@@ -117,7 +117,7 @@ def check_matrices(
         if values_matrix and (less_term_matrix or greater_term_matrix or equal_term_matrix):
             raise ValueError(
                 "You cannot fill 'values' (matrix before v8.7) and a matrix term:"
-                " less_term_matrix, greater_term_matrix or equal_term_matrix (matrices since v8.7)"
+                " 'less_term_matrix', 'greater_term_matrix' or 'equal_term_matrix' (matrices since v8.7)"
             )
         return values
 
diff --git a/tests/integration/study_data_blueprint/test_binding_constraints.py b/tests/integration/study_data_blueprint/test_binding_constraints.py
index 7bcd62c7da..1597eb3c7d 100644
--- a/tests/integration/study_data_blueprint/test_binding_constraints.py
+++ b/tests/integration/study_data_blueprint/test_binding_constraints.py
@@ -511,10 +511,11 @@ def test_lifecycle__nominal(self, client: TestClient, user_access_token: str, st
             headers=user_headers,
         )
         assert res.status_code == 422
-        assert (
-            res.json()["description"]
-            == "You cannot fill 'values' (matrix before v8.7) and a matrix term: less_term_matrix (matrices since v8.7)"
-        )
+        description = res.json()["description"]
+        assert "cannot fill 'values'" in description
+        assert "'less_term_matrix'" in description
+        assert "'greater_term_matrix'" in description
+        assert "'equal_term_matrix'" in description
 
         # Creation with wrong matrix according to version: Should fail
         res = client.post(
@@ -531,7 +532,8 @@ def test_lifecycle__nominal(self, client: TestClient, user_access_token: str, st
             headers=user_headers,
         )
         assert res.status_code == 422
-        assert res.json()["description"] == "You cannot fill a 'matrix_term' as these values refer to v8.7+ studies"
+        description = res.json()["description"]
+        assert description == "You cannot fill a 'matrix_term' as these values refer to v8.7+ studies"
 
         # Wrong matrix shape
         wrong_matrix = np.ones((352, 3))