how the backend confirmation comes to EB

Hi experts,

In ECS scenario we can do confirmation directly in the backend system. How the GR number along with other details comes to the EBP system in this case. Is it through bbp_get_status_2 job . I have gone through this program but there is a mention of PO updation . There is no mention of GR or invoice explicitly.

please clarify.

thanks

sankar