Dear Vishal,
Please check your customizing according to note:
109254 - Customizing stock transport order Cross Company
The deliveries showed in billing due list are taken from billing due list table VKDFS. The deliveries having at least one item with billing status VBUP-FKSTA = A or B are put in VKDFS.
Normally, if somebody creates a proforma invoice (billing type F8) the billing status of the delivery is not changed. The proforma invoice does not have an effect on the billing status in standard circumstances. This ensures that you can create as many proforma invoice as you want.
Please also check the billing relevance of the item category. If the billing relevance TVAP-FKREL = D (relevant for proforma), no entries are taken into the billing due list table VKDFS and the delivery does not appear in VF04.
Best regards,
Csaba