Delphi update error cannot perform this operation on closed dataset..

Adding record is called inside opened transaction. There are problems with
using this method in multi−user mode. When execution point of one
application instance is set after Post but before the transaction is
commited, calling this method from other instance of application raises such
exception: ‘Could not update; currently locked.’.
ADOConnection1.BeginTrans;
ADODataSet1.Open; // THIS <<<<<!!
ADODataSet1.Append;
ADODataSet1['id'] := some_id;
ADODataSet1.Post;
ADODataSet1.Close;
//… Others Commands
ADOConnection1.CommitTrans;

open dataset first to update..

kegagalan dalam update dataset dalam delphi karena dataset belum dibuka

error cannot perform this operation on closed dataset..

ADODataSet1.Open;