Clearing the most recent recociliation of an account

[John Gustafson]

I have the distict feeling thatI caan’t do this but I have to ask.
I’m using gnocash for personal financial tracking. In reconciling one of my credit card accounts it seems I made some errors last month but somehow goy things to balance out so now all of last monts charges are “reconciled” 

Is there any way to clear the prior periods reconciliation and allow me to start over?

John gustafson