Solution : https://service.sap.com/sap/support/notes/1330895 (SAP Service marketplace login required)
Key words :
correct customer message process component, sv-smg-ser-ewa, running alternating service sessions, implement st-ser 701_2008_2, process component sv-bo, terms st-ser, component sv-bo, chapter 1-service summary, db request time, prerequisites program errors