Many time lot of Deliveries appear in VF04 – Billing Due List, which are not supposed to be Invoiced. Even if you have entered Billing Block in Sales Order or Delivery, but still they will appear in Billing Due List. The classic example would be Sales Process that just require Proforma Invoice & the Billing Relevance in Item Category was select as M. Thus the Delivery of such Sales Order will in Being Processed even after Proforma Invoice was created.
In case like this you should run T-Code VL_COMPLETE:
Enter either the Delivery Number or Delivery Type & created on Date Range.
Select Update Change Data under Flow Control.
System will generate the list of all the open Deliveries for the selected criteria.
Now, either select all the Deliveries or required Deliveries & hit the Release Button.
System will change Billing Status of the Deliveries to C i.e. Fully Invoiced (VBUK – FKSTK – Sales Document: Header Status and Administrative Data)
Subsequently the above Deliveries will not appear in VF04 – Billing Due List.