Unintentionally overcharged a customer via EFT but keyed in correct amount in POS Lite. Now I cant r

I unintentionally overcharged a customer via EFT ($59.90) but put through the correct price in POS Lite 2013 ($59.00). I realised the mistake had been made during END OF DAY. Incorrectly thinking I'd be able to refund the difference the following day,  I took into account the .90c difference when completing END OF DAY by adding .90c on to the EFT amount and was able to balance (effecitively saying there was 90 cent more than I had in the register). Now I cant reconcile in Reckon Accounts Plus 2013 as we are + 90cents. I know now i shouldnt have plucked 90cent out of the air and balanced son hoping someone has an idea of what I can do to fix this? Any advise is greatly appreciated.