diff --git a/src/dayamlchecker/messages.py b/src/dayamlchecker/messages.py
index 7bb9431..b0f5a35 100644
--- a/src/dayamlchecker/messages.py
+++ b/src/dayamlchecker/messages.py
@@ -640,8 +640,8 @@ class MessageDefinition:
         template="question block is missing an `id`: {snippet}",
     ),
     MessageId.MULTIPLE_MANDATORY_BLOCKS: MessageDefinition(
-        code="EG415",
-        severity=Severity.ERROR,
+        code="WG415",
+        severity=Severity.WARNING,
         finding_class=FindingClass.GENERAL,
         summary="Interview has more than one mandatory block",
         template="interview has more than one `mandatory: True` block: {labels}",
diff --git a/tests/test_yaml_structure.py b/tests/test_yaml_structure.py
index 502b072..1c8ca36 100644
--- a/tests/test_yaml_structure.py
+++ b/tests/test_yaml_structure.py
@@ -2478,7 +2478,7 @@ def test_multiple_mandatory_blocks_are_reported(self):
 """
         errs = find_errors_from_string(yaml_text, input_file="<string_invalid>")
         self.assertTrue(
-            _has_code(errs, "EG415"),
+            _has_code(errs, "WG415"),
             f"Expected multiple-mandatory-blocks finding, got: {errs}",
         )