If you have added new fields or made any other changes to the table you can reflect all that on the related DataSource using by Restore command on the appropriate Form
Quoted from the manual:
Notice that after accessing the form in the AOT the definition of the data source
is cached locally in the definition of the form. If changes are made when you
create a new field in the underlying table, you must restore the form to access the
new field in the form. Remember to save the form before you click Restore from
the shortcut menu.