When attempting to reconcile a statement, you must have transactions to reconcile, i.e they must be associated to the statement.
To view this:
Click Cash Manager.
On the Statements tab, to see the statement transactions, right-click and select View
If transactions are visible, yet you still are not able to reconcile the statement, Support will need to investigate further. Therefore please raise a contact us, reference the title of this article and please include details of the statement affected.