Solution : https://service.sap.com/sap/support/notes/77938 (SAP Service marketplace login required)
Key words : 
user-defined data transfer routine, additional key words sis, data transfer routine, vbrk-vbtyp ca '56', clear vbrk-stafo, clear vbrp-stafo, 'update statistics' field, statistical data, statistics update, intercompany billing
Related Notes : 
       
| 204130 | SIS update: Collective note | 
| 174141 | SIS: Collective note - Customizing |