Demantra 7.3.1.- How does table engine_branch_list gets populated?

In Demantra 7.3.1, How does table Engine_branch_list gets populated.
I checked the procedure  insert_unit and dyn_insert_unit_branch_id

Its using following query

SELECT s.item_id                    item_id,
                        s.location_id                location_id,
                        MAX(sales_date)              sales_date,
                       
                        MIN(m.is_fictive)            is_fictive ,
                        SUM(CASE WHEN (s.sales_date > '06-06-2011 00:00:00' AND s.sales_date <= '06-06-2011 00:00:00') THEN 1
ELSE 0 END) sales_in_old_fore,
                        SUM(CASE WHEN (s.sales_date > '06-06-2011 00:00:00' AND s.sales_date <= '06-18-2012 00:00:00') THEN 1
ELSE 0 END) sales_in_new_fore
                       
                 FROM   sales_data s, mdp_matrix m,  engine_branch_list e