QB Issue Resolution:

You already messed up the bank recs from January by deleting the deposit.

Easiest way is to re-enter the deposit & then on the next bank rec. check it off as if it cleared in that month.

Resolution for Issue 'I deleted a deposit in error from a prior month that has been reconciled. How do I re-enter it without messing up 10 mths of reconciliations?' available: Yes (Solved).
Source: Intuit Community forum.

I deleted a deposit in error from a prior month that has been reconciled. How do I re-enter it without messing up 10 mths of reconciliations?: 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 recs
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Error Recovery for bank recs [Canada]
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