docs: added a clarifying note to the description of the parent field in the Account resource

Google APIs · copybara-github · commit 1bd384078ed8 · 2025-03-19T18:37:11.000-07:00
PiperOrigin-RevId: 738615787
diff --git a/google/shopping/css/v1/accounts.proto b/google/shopping/css/v1/accounts.proto
@@ -203,6 +203,9 @@ message Account {
   // The CSS/MC account's parent resource. CSS group for CSS domains; CSS
   // domain for MC accounts. Returned only if the user has access to the
   // parent account.
+  // Note: For MC sub-accounts, this is also the CSS domain that is the parent
+  // resource of the MCA account, since we are effectively flattening the
+  // hierarchy."
   optional string parent = 5;
 
   // Manually created label IDs assigned to the CSS/MC account by a CSS parent
