Lua script in the DataChanged action list (or in other scripts) can be used to validate fields. If a validation error message has been set on a field, it will be shown with a validation mark (see example below). If the user attempts to save a form that is not validated, an alert will be shown containing the validation messages for each field, and further processing of the action list will be canceled.
in the DataChanged and OnLoad event of the 'phone' field:
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