Get BP number with customer user (Obtén el numero de BP con el usuario del cliente)

Only use one function. It's very simple.

      CALL FUNCTION 'YCRM_CC_FUNC_GET_FRONT_OFFICE'
        EXPORTING
          user       = sy-uname 
        IMPORTING
          og_partner = lv_bp.

sy-uname is the global variable in ABAP contains the current user.
lv_bp is the local variable containing BP code.