Intercompany Transaction return

[Omdubz]

I am working in GP 10 and I have a question regarding an intercompany transaction. We do not have a 3rd party application as this is pretty new to us so this is how it works from us. We have Company A whom purchase something from Company B. The customer pays company A and we pay the vendor form company B. The PO in company A is credited out along with the customer invoice in Company B. Now I have an order that needs to be cancelled how can I go about returning this. If the customer invoice links with the PO how can I process a return. I started a return in company A and did the return on the invoice but the PO to vendor side is sitting open but that was credited out. I can't even do a return in company B since the customer invoice was credited out. Please help with this.