SQL seems to auto COMMIT the transaction(if any) for the ApplyUpdates
method. Is this right? or how to handle it if we need to apply cached
updates within a transaction.

The following is the code, and it will hit an error upon "DbCommit" - Error:
No transactions to commit (because SQL has implicited commited it upon the
method ApplyUpdates before it).

Thanks in advance.

User input with a DbGrid with a query, Cached=True updates. once done, click
"post" button, here is what the button does:

DbStartTransaction;
try
    update some other tables ...

     AQry.ApplyUpdates;
     DbCommit;
     QryItem.CommitUpdates;
except
  DbRollback;
end;