Dear Mr.Miguel,
If still you are facing issue Pls try to refer SAP NOTE NO: 956054 (or refer below link to access the note) and make sure you have done the same configuration for BP to customer / vendor synchronization process.
http://ddata.over-blog.com/xxxyyy/0/22/64/61/note-oss/0000956054-Synchronisation-CVI-avec-REFX.pdf
Regards,
Rao