How can Reconciliation affect your QuickBooks desktop? QuickBooks application has multiple features like managing payroll tables, tax tables, monthly wages, etc. One of the other best features of QuickBooks is maintaining a balance sheet that is linked with your bank. It can be important as, in any case, either bank or QuickBooks servers get errors, so this dual check option is beneficial for you to avoid any loss.
We cannot say there will be no error in online transactions; there are multiple cases found in the sync of the balance sheet and the bank statement due to which the payment history is disbalance and if you do not correct this problem or undo the Reconciliation in QuickBooks desktop can help you from facing any loss and maintaining the balance sheet and Bank payment up to date.
Source: https://www.axpertadvisors.com/undo-or-delete-a-reconciliation-in-quickbooks/