Close a "Debit" and "Open" Status Bill

Question 1: The bill in "Debit" status- see snippet below, was wrongly created (amount is incorrect).  Hence, we reversed it.  Upon reversal, MYOB automatically generated a bill with an "Open" status. Could you please guide me on how to convert both line items to a "Closed" status?

Question 2: How do I record a supplier's Credit Note in the Purchase Register?  Available Purchase Type options are as per below:

Thanks.