- Pre-Form trigger will be fired before entering into the form. It is the first trigger that fires when a form is run;
- Pre-Form fires before the form is visible. It is useful for setting access to form items, initializing global variables, and assigning unique primary key from an Oracle sequence.
- When-New-Form-Instance trigger will be fired whenever form is ready to accept the data from the user.
- Another main difference between the two is that you cannot navigate in a pre-from trigger (restricted) whereas you can navigate in a when-new-form-instance trigger.
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