diff --git a/src/python_testing/TC_IDM_1_4.py b/src/python_testing/TC_IDM_1_4.py
index 507b5d74254abf..34d75f7d8f6184 100644
--- a/src/python_testing/TC_IDM_1_4.py
+++ b/src/python_testing/TC_IDM_1_4.py
@@ -74,7 +74,11 @@ async def test_TC_IDM_1_4(self):
         cap_for_batch_commands = 100
         number_of_commands_to_send = min(max_paths_per_invoke + 1, cap_for_batch_commands)
 
-        invalid_command_id = 0xffff_ffff
+        # Use a valid (according to MEI definition) command-id (in this case belonging to Test Vendor MC with prefix 0xfff4)
+        # which should never be existing on a prodiction device. We use this decodable id to prevent hitting issues with the
+        # specification being not clearly defined in respect to decoding vs processing the invoke requests.
+        invalid_command_id = 0xfff4_00ff
+
         list_of_commands_to_send = []
         for endpoint_index in range(number_of_commands_to_send):
             # Using Toggle command to form the base as it is a command that doesn't take