Changing the memo line will not affect your balances.  You will get a warning that the transaction has been changed, however.   But if it is just the memo words, it won’t affect the bank rec at all.

Resolution for 'Correcting A Reconciled Journal Entry issue: 'I need to edit the description of two journal entries that have already been reconciled (1 in June and 1 in July). I would prefer to just edit the descriptions and not redo the reconciliations. If I am to make the change and it re-reconciles those items what effect will that have on the October reconciliation? Will it change the reconciliation report for June and July by making the journal entries in question reconciling items? Thank you in advance.' available: Yes.

The Correcting A Reconciled Journal Entry 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 Correcting A Reconciled Journal Entry issue yourself by looking for a resolution described in the article. If it is a complex Correcting A Reconciled Journal Entry issue or you are unable to solve the issue, you may contact us by clicking here or by using other Correcting A Reconciled Journal Entry support options.

For more information about resolving issues related to Correcting A Reconciled Journal Entry in Quickbooks/QBO or to get support for the issue 'I need to edit the description of two journal entries that have already been reconciled (1 in June and 1 in July). I would prefer to just edit the descriptions and not redo the reconciliations. If I am to make the change and it re-reconciles those items what effect will that have on the October reconciliation? Will it change the reconciliation report for June and July by making the journal entries in question reconciling items? Thank you in advance.', click the link below: