Use the following guidelines when creating the structure of your new form or editing an existing form.
List field elements in the order in which you want them displayed on the page. The order of the field elements in the form determines the order in which the elements are displayed in the browser.
Place the referenced field before the field referencing it. If a field has an expression that references a value in another field, place the referencing field after the referenced field.
Disabled fields are ignored when logically true. If any field defines a Disable expression, it is evaluated. If the result of the Disable expression is logically true, the field will be ignored during form evaluation.