How do I clear unpaid invoices?

[Robert Smits]

I use gnucash 2.4.13 to manage finances of my Amateur Radio Club.

Each fall I send out invoices for membership dues and then when I receive 
payment, I process the payment and it goes into our checking account.

Of course, not everyone invoiced pays, so next year I still have outstanding 
invoices that show up on the balance sheet as accounts receivable. 

How do I get get rid of these outstanding invoices? I thought I could just 
mark the invoices as not active, but they still seem to show up in accounts 
receivable.

All advice gratefully received.

Bob Smits.
-- 
bob at rsmits.ca