Unpost a AR payment

Hello,

         How do we unpost a AR payment/deposit? I see that there is a unpost deposit group action, but this would unpost all the payments in the group.

         But lets say i have billed for $10 and i have deposit for $10 and we have applied the payment and item is closed now, but later we found out the check did not clear then how can we reverse the payment or how can we reopen the item as it is closed.

         Please let me know.

Thanks,

Rama Kilaru