Is this a deposit?  If so then their typically is an issue with one of receipts in the grouped up deposit.  Pull up each transaction in the receive money screen and in the upper left Deposit Ticket ID Field add a -1, -2, etc to the end of each of them.  Then go back into the reconciliation window and clear each one.  If you come across one that doesn't allow you to clear it then that is your issue.  Delete and re-enter that cash receipt.  I can take a look if needed as well.  [email protected]