Solution : https://service.sap.com/sap/support/notes/394975 (SAP Service marketplace login required)
Key words : 
img --> enterprise buyer professional edition  --> master data   --> products    --> special settings, source tab      source field1              vendor        crmt_acs_h_bbp  cvendorbp2              product        crmt_com_i_bbp  productsap118, transaction sm34 -> /sapcnd/v1_t682 -> button 'display'access   table   exclusive   condition, source tab      source field1              product        crmt_com_i_bbp  productin addition, source tab      source field1              bbp_item_guid  crmt_com_i_bbp  bbp_item_guidsap001, customer relationship management  > basic functions    > pricing    > condition technique, type1        pr          bbp    sap001  01002        pr          bbp    sap118  01000100, transaction sm30 -> prcv_condtype -> button 'display', type1        pr          bbp    sap016  0100maintain, view cluster /sapcnd/v1_t682
Related Notes : 
       
| 420343 | TIP: Backend price transfer in product conditions | 
| 401650 | |
| 379235 |