$form->{employee_id} = $form->{old_employee_id} if $form->{old_employee_id};
$form->{salesman_id} = $form->{old_salesman_id} if $form->{old_salesman_id};
$form->{employee_id} = $form->{old_employee_id} if $form->{old_employee_id};
$form->{salesman_id} = $form->{old_salesman_id} if $form->{old_salesman_id};