Match exception report has exceptions with older instance numbers. How do we get those to process o

We have lines on the match exception report that show instance numbers that are very old.  We have made changes to the PO or voucher and since these lines are not going through the most recent match process (i.e. more recent instance) they are not using the updated information in the match.  How can we get that fixed?

Example:  We have updated the PO with a new match control.  The match exception line for that PO is still showing the old match control that has since been updated on the PO.  How do we get the match process to include these older voucher/PO lines in a more recent instance (i.e. match process)?