How to write off a debt but still show client as having not paid?

[csscs2013]

I want to write off a debt a client owes me but if i use a credit note it will not show that the client has not paid i think and will not show length of time to pay i think, basically i want to know they never paid so if i do future work for them i will stipulate different terms to my standard ones

[Glenn]

The normal procedure is to flag as Bad Debt, this option will appear in the invoice preview once 6 months has passed since the issue date.