STP EOY Finalisation when not set up correctly

Hi

I have a client who has been using MYOB Business to pay their staff. They neglected to set up STP Reporting and I now find that there was a income type code missing in the taxes section of their setup. This has now been corrected but the EOY finalisation report is being rejected by the ATO due to prior pays being processed without that code there. 

Is there a way to correct this problem - it is 6 months of pays for a restaurant so rekeying all of them would be a laborious project.

Thanks