How can I generate a unique sequential number on a PDF form field? I want the sequence to be locked once form is saved (Save as) and generate a new sequence when a new form is opened. I also have a reset form button to clear all fields on the form an

How can I generate a unique sequential number on a PDF form field? I want the sequence to be locked once form is saved (Save as) and generate a new sequence when a new form is opened. I also have a reset form button to clear all fields on the form and wouldnt want to affect the sequence field unless it is saved.