/resources/customer.proto

--- v19/resources/customer.proto    2025-08-05 14:37:38.000000000 +0000
+++ v20/resources/customer.proto    2025-08-05 14:37:46.000000000 +0000
@@ -96,9 +96,8 @@
   // operation.
   CallReportingSetting call_reporting_setting = 10;

-  // Immutable. Conversion tracking setting for a customer.
-  ConversionTrackingSetting conversion_tracking_setting = 14
-      [(google.api.field_behavior) = IMMUTABLE];
+  // Conversion tracking setting for a customer.
+  ConversionTrackingSetting conversion_tracking_setting = 14;

   // Output only. Remarketing setting for a customer.
   RemarketingSetting remarketing_setting = 15
@@ -236,10 +235,9 @@
   bool enhanced_conversions_for_leads_enabled = 7
       [(google.api.field_behavior) = OUTPUT_ONLY];

-  // Immutable. The resource name of the customer where conversions are created
-  // and managed. This field is read-only.
-  string google_ads_conversion_customer = 8
-      [(google.api.field_behavior) = IMMUTABLE];
+  // The resource name of the customer where conversions are created and
+  // managed. This field is read-only.
+  string google_ads_conversion_customer = 8;
 }

 // Remarketing setting for a customer.