diff --git a/backend/app/domain/test_entity.py b/backend/app/domain/test_entity.py
index d9ae907..2e94209 100644
--- a/backend/app/domain/test_entity.py
+++ b/backend/app/domain/test_entity.py
@@ -45,13 +45,15 @@ class TestState(str, enum.Enum):
     in_review = "in_review"
     validated = "validated"
     rejected = "rejected"
+    disputed = "disputed"   # one lead approved, the other rejected
 
 
 VALID_TRANSITIONS: dict[TestState, list[TestState]] = {
     TestState.draft:           [TestState.red_executing],
     TestState.red_executing:   [TestState.blue_evaluating],
     TestState.blue_evaluating: [TestState.in_review],
-    TestState.in_review:       [TestState.validated, TestState.rejected],
+    TestState.in_review:       [TestState.validated, TestState.rejected, TestState.disputed],
+    TestState.disputed:        [TestState.validated, TestState.rejected],
     TestState.rejected:        [TestState.draft],
     TestState.validated:       [],
 }