DLL interface only. This event is fired right after a field has been validated by FORMS’ internal routines or the FieldValidateExisting event, and the field’s status has been set to Complete. The event is fired at least once for each filled-in field, but could also be fired several times if the field value is edited and validated repeatedly. It is backwards compatible with the DLL interface used in FORMS version 3.1 and earlier.
Field, form, set, and batch validation