Invoice creation request creating both credit memo and debit memo

Hello All,

I have created one invocie correction request.

First line item is for credit, showing positive value

Second line item is for debit, showing negative value.

When I created billing document from this invoice correction request, I got a credit memo for 1st line item and debit memo for 2nd line item separately.

Ideally i should be getting only a single credit memo for the difference in pricing (positive value).

What could be the reason for this?

Regards

Sonalika