QB Issue Resolution:

QuickBooks Online doesn’t have an ‘Undo Last Reconciliation’ feature.

To undo a reconciliation, you’ll need to unreconcile each transaction via the Register.
1.Select Transactions on the left menu then Registers.
2.Click on the account then click Go to Register
3.Find the transactions that need to be unreconciled, one at a time.
4.To highlight click on the transaction.
5.Click on the R on the top line of the transaction, which is between the Payment and Deposit or Charge and Payment amount. Clicking in this field will allow you to change the status of the transaction to the desired status from blank = unreconciled to C = Cleared.
6.Click on Save.
7.A message will appear: This transaction has already been reconciled. You should only remove the R if you’re correcting a mistake. Are you sure you want to remove the R? click Yes.

Continue this process for each transaction on the reconciliation report or statement you want to unreconcile.

Resolution for Issue 'Undo a Bank Reconciliation in QBO' available: Yes (Solved).
Source: Intuit Community forum.

Undo a Bank Reconciliation in QBO: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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