Credit Note Adjustment against Invoice

Hi Experts,

Is there a way to adjust A/R credit memo against and A/R invoice and have the balance amount shown as outstanding in the invoice.eg : If I have a credit note of Rs 1000 issued to a customer and the invoice amount is Rs 3000 I want to adjust Rs 1000 against invoice so that the net payable amount against the invoice is Rs 2000 only,

I am using 2007B PL04.

Regards,

Asap