STO based IV invoice not appearing in VF04 list

We are having STO based IV invoice.In Billing due List, (t-code VF04), the interco delivery is appearing with billing type F2. The delivery is not appearing with IV type billing document. However, the IV invoice is getting created through VF06 or even through VF01 by selecting billing type as IV in the selection screen. The delivery header status is POD = Complete, Relevant for interco billing and IBilling docs= Not Invoiced

Can somebody throw some light as to why IV billing type is not appearing in VF04 - Billing due list for STO based deliveries ? Is this behaviour SAP standard ?

Thanks in advance

Siddhartha