QB Issue Resolution:

let you know that you can edit your checks without undoing your reconciliation. Simply open each of them and do your correction. Then, when you’re prompted that you’re editing a reconciled transaction, just select Yes to confirm.

How will this process affect your reconciliation? Well, when you modify the amounts of the reconciled checks, the beginning balance of your next reconciliation will also change. I’ve included a screenshot with an explanation about the effect of this change.

Resolution for Issue 'How do I correct Checks changed after bank reconciliation is completed without undoing the entire rec?' available: Yes (Solved).
Source: Intuit Community forum.

How do I correct Checks changed after bank reconciliation is completed without undoing the entire rec?: 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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