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There is no way to cancel a user initiated print request from Acrobat JavsScript, you can only pop up an additional warning from WillPrint if all required fields have no been filled out. Once the warning is closed, the print request will continue.
There is no way to prevent printing of a printable file.
You CAN put out a warning that what they are printing is incomplete.
You CAN arrange to have a printable field like a big "INCOMPLETE"