2lis_11_VASTI field FKSTA- Billing status of delivery-related billing documents not getting updated
I have a requirement wherein I need to fetch the FKSTA - Billing status of delivery-related billing documents into the datasource 2lis_11_VASTI. Though this field is present, it doesn't display any values. I have gone through a few SAP notes like 651603 - 2LIS_11_VASTH and 2LIS_11_VASTI billing status not filled and checked a lot of threads on this topic but have not found a concrete solution yet.
I have checked the settings in vov7 and vov8 and everything seems to be in place. I have also checked in table VBUP, when I filter based on field FKSTA = 'C', it shows me the outbound delivery document nos.
I would like to know how and where I can identify the 'billing status of delivery- related' document. Also, how can i incorporate it in the standard
Appreciate any help I can get on this as it is urgent.