diff --git a/shared/transactions/oracle_set.yaml b/shared/transactions/oracle_set.yaml
index 1eefe0f..8513efe 100644
--- a/shared/transactions/oracle_set.yaml
+++ b/shared/transactions/oracle_set.yaml
@@ -80,6 +80,10 @@ components:
             Not included if the last update transaction didn't include the BaseAsset/QuoteAsset pair.
           minimum: 0
           maximum: 10
+      x-custom-validation:
+        mutualPresence:
+          - field1: AssetPrice
+            field2: Scale
 
     OracleSetErrorCode:
       $id: OracleSetErrorCode