Tanja:

Once you have matched the transactions on the bank statement panel, pressing OK will remove them. If you want to re-do the bank reconciliation you need to delete the items from the bank statement side as Douglas explained above. You can only import the bank statement again if the "Delete import file on success?" is deselected. Otherwise, you will need to download the bank statement again.

Once the bank statement items have been matched, they will be indicated as "Matched" in the bank statement panel, and pending (i.e., O > M) in the bank reconciliation panel. Printing the Worksheet report will give you a list of all the pending items.