Do you want to undo your reconciliation in Quickbooks? To learn how to undo reconciliation in quickbooks online you must go through the step by step procedure of doing so. Quickbook users can undo the reconciliation of transactions online directly through their accounts. It is then advised for you to have a look at the ‘Registers’ section given on the Banking page. The ‘R’ which denotes that the recorded dada needed to be un-reconciled will appear, you need to change it.