hi experts

i am creating a workflow for vendor tracking

i have to send vendor no from internal table.

i am getting vendor no into table container but i am unable to send through send mail.

i checked my bo method, data is present in table container.

my code is below

BEGIN_METHOD FORBDC CHANGING CONTAINER.

CALL TRANSACTION 'ZVEN_ALV3'.
  END_METHOD.

BEGIN_METHOD FORMAIL CHANGING CONTAINER.
*DATA:
*      ITEM TYPE SWC_OBJECT OCCURS 0.
DATA : refno TYPE char20.
DATA : item TYPE TABLE OF zvendor_data.
DATA : lv_ref TYPE zurno.
get PARAMETER ID 'ZREFRENCENO' FIELD refno.

clear : lv_ref.
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
   EXPORTING
     input  = refno
   IMPORTING
     output = lv_ref.

SELECT vendor_no FROM zvendor_data INTO CORRESPONDING FIELDS OF TABLE item
       WHERE ref_no = lv_ref.

   SWC_SET_TABLE CONTAINER 'item' ITEM.
END_METHOD.

if i am passing hard code in select query then i m getting vendor no in my send mail.