QB Issue Resolution:

Simply click + reconcile>reconciliation history (top right corner)>under action>view report dropdown, click undo.

Resolution for Issue 'We upgraded to QBO in July 2017. Because of Audit JE’s, I need to undo June 2017 bank reconcilliation. How can I do this in new system? If possible.' available: Yes (Solved).
Source: Intuit Community forum.

We upgraded to QBO in July 2017. Because of Audit JE’s, I need to undo June 2017 bank reconcilliation. How can I do this in new system? If possible.: 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.

Support for bank reconcilliation
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Error Recovery for bank reconcilliation [Canada]
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