/errors/setting_error.proto

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--- v10/errors/setting_error.proto  2022-06-06 16:29:23.000000000 +0000
+++ v11/errors/setting_error.proto  2022-06-06 16:29:28.000000000 +0000
@@ -77,6 +77,11 @@

     // The setting value is not compatible with the campaign type.
     SETTING_VALUE_NOT_COMPATIBLE_WITH_CAMPAIGN = 20;
+
+    // Switching from observation setting to targeting setting is not allowed
+    // for Customer Match lists. Please see
+    // https://support.google.com/google-ads/answer/6299717.
+    BID_ONLY_IS_NOT_ALLOWED_TO_BE_MODIFIED_WITH_CUSTOMER_MATCH_TARGETING = 21;
   }