Intercompany Billing Credit & Debit Note

Dear All,

I have configured intercompany billing. Now i can able to create invoice for Supplying part to Ordering Party. This invoice creation without sales order na. So, if i want to create credit & Debite memo for supplying party to Ordering party how to create. Because here we are creating invoice wioth out sales order and creating with reference of delivery note. In this process sales order creation belongs to ordering party to customer. So where we can maintain Credit & Debit note for Supplying party to ordering party. I think when we create invoice can we maintain billing type as credit note? please suggest me to maintain Cr. & Dr Memo In Intercompany billing between Supplying company to Ordering company.

Thanks & Regards,

Anj