In 4500 a new notice error/warning was added to stop cancelled notices being loaded into the database.
It is only optional but the warning must be set to an error which is what has stopped you sending the FPN. Please go to TMA > Reference Data > Activities>Notice Warnings. Put the form in query mode and query back warning number 54. Make sure that on send it is set to warning or not used. This will then enable you to send FPNs against the cancelled notices.
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