Is there a way to override the new tax periods that come in version 12. If tax invoices have been posted into period 12 during the month of January they are now appearing on the Tax report in period 13 and not in Period 12 but the invoice dates are December 2013. Is there a way to reverse these and reenter them or for them to appear in the correct Tax period on the Tax report.
I have tried to use CTRL+ALT+T to revert to the old tax processing and reverse them but this has not helped.

Thank you