[Kmymoney] Reconcile problem

[richard_get_iplayer]

I have messed up reconciliation of an account. 

The last reconcile balance is 564.62 but the cleared amount is 435.38.
They should be the same. 

I think I finalised a reconciliation when I shouldn't have. My backup
has the same error.

I cannot find a way to change the cleared amount. Seems like once I've
messed up the reconciliation there is no way of undoing what I've done.

Is there anyway I can resolve this?