Solution : https://service.sap.com/sap/support/notes/158357 (SAP Service marketplace login required)
Key words : 
additional key words mais, component supplier industry, outstanding order quantity, schedule line level, update log displays, error getw_not_assigned occurs, open sales order, alesys    mc_alesysabart     abart 2, additional items, sales orders
Related Notes : 
       
| 552910 | When setting up deliveries, VSMNG_L is not filled | 
| 204130 | SIS update: Collective note | 
| 135922 | Sales document: Statistics structures are not filled | 
| 125700 | MCVBEL-VSMNG_L and MCVBEL-VSWRT_L not filled |