Hi
Sales order Delivery document created : VBAP
Sales order Delivery document posted : LIPS
Sales order billing generated : VBRP
If you mean the conditions to link the tables above, you should use VBFA table, but it depends on where you need to start the search:
If you can start from VBRP table, all links are saved here:
VBRP-VGBEL, VBRP-VGPOS are the key of sales delivery item (LIPS)
VBRP-AUBEL VBRP-AUPOS are the key of sales order item (VBAP)
So you don't need to use VBFA
If you need to start from delivery
LIPS-VGBEL, LIPS-VGPOS are key for sales order (VBAP)
so you need to use VBFA in order to get the bill item
If you need to start from sales order
you need to use VBFA in order to get both data (delivery and bill item)
Max