QB Issue Resolution:

The cause of this is either old checks or deposits that never cleared the bank or were recorded incorrectly or twice. You don’t want to void these transactions since it will affect prior years’ financial statements. You should click on each transaction and note the income or expense account for each. You make a general journal entry for each transaction. So if you have an uncleared check for office expense, you create a general journal entry that credits office expense and debits the bank account on which the check was written in the current period. Enter the check number in the memo field. When you complete the next bank reconciliation there will be an entry in both the check column on the left and deposit column on the right. Check off both.

Resolution for Issue 'old transactions on register showing when I go to reconcile, how can I get them off the register?' available: Yes (Solved).
Source: Intuit Community forum.

old transactions on register showing when I go to reconcile, how can I get them off the register?: 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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