Invoice correction request with debit invoice

Hi,

I have created a sales order,invoiced the same.But the rebate was too high for one line item ie,customer was priced low.So i have created an invoice correction request sales order with reference to the invoice.In that,i have entered the correct rebate .Now the customer needs to pay the corrected high amount.But the net value is coming as negative in invoice.Actually the order should have created a debit invoice,but in my case it has created credit invoice.The billing type for order type has been set as credit invoice only.Is there any possibility that debit invoice is created for this case.is there any setup or workaround for the same.

Thanks in advance,

Sreeja