/enums/conversion_value_rule_primary_dimension.proto 

--- v17/enums/conversion_value_rule_primary_dimension.proto 2024-10-17 03:48:52.000000000 +0000
+++ v18/enums/conversion_value_rule_primary_dimension.proto 2024-10-17 03:48:57.000000000 +0000
@@ -58,5 +58,8 @@

     // When multiple rules are applied.
     MULTIPLE = 8;
+
+    // When a query-time itinerary condition is satisfied.
+    ITINERARY = 9;
   }
 }