Hi S Hartland,
You can review the Audit Log to see the details of the transaction. Then, manually recreate it.. Let me guide you how.
Once done, go back to your register and change the status to Reconciled (R) manually. For the detailed steps, please check this article: How To Reconcile Transactions.
If there's anything else that you want us to help, please let us know. We'll always be right here to help.