Process one last pay after notifying ATO of termination date

Ive got a situation where an employee has resigned after a few months, the final pay supposedly done and the ATO notified of the termination date through the STP reporting.  It seems now (*sigh*) there are extra hours owing that were not included in the final pay.  The termination date remains the same, but we need to pay the hours previously missed.  Can the hours be processed and paid at current date and leave the termination date alone.  Or do we need to "undo" the reported termination date,  run the pay, then re-advise the same termination date? Thank you