// navigate to the LoanNumber field of a Loan object with ID loanID inside an Order with an ID of orderID.
OrderUri moniker = new OrderUri( OrderKind.Order, OrderNavigationTarget.HotSpot, orderID, "Loan", loanID, "LoanNumber" );
IShell shell = sps.GetService<IShell>( );
shell.OpenStandardEditor( moniker );