I have deleted two supplier transactions that had been reconciled. Can I fix this by creating a supplier credit and receiving it in?

Hello shirley6, 

If the two transactions were payments made to the supplier then creating a supplier credit would have the reverse affect on the suppliers account as this would leave an unapplied credit and there is no field on a supplier credit to assign a bank account. 

We would recommend recreating the original transactions and re-reconciling these - to re-reconcile, simply go to Accounting > Reconcile and enter the ending balance and date as of the last reconcile then select reconcile - the transactions will then appear on the next screen to check.

Thanks