Solution : https://service.sap.com/sap/support/notes/126634 (SAP Service marketplace login required)
Key words : 
additional key words va01, sales information system, attached advance corrections, sales document takes, document files, large number, schedule lines, performance improvements, statistics updates, subsequent processing
Related Notes : 
       
| 154091 | Performance in delivery process: Collective note | 
| 113040 | Performance of sales document processing |