How to fix an error from 2017 in 2018 where a journal has impacted the bank reconciliation in Reckon

So are you saying that there are cheques/payments sitting as uncleared in your bank rec and you need to reverse them out?  if so, go into the uncleared entries and note the details - account allocated to, tax code used, original date, payee etc.  Now create a Journal entry - which will be dated in this financial year - the first line will be for the bank account and be a debit entry - put in details about the original date of the cheque and the payee etc - then the 2nd line (and others if applicable) will be credit entries to the same account you found in the original entries - use the same tax code etc and put in details of what you are doing in the memo. Once these are entered and saved - go to your Bank Rec screen and you will then be able to tick both the uncleared original payment and the journal entry you just created - and this will clear them from the Bank Rec.  Hopefully I have understood your issue?  cheers Linda