Using BUPA_ADDR_CHANGE for Telephone

Hello All,

    I was trying to use the function module BUPA_ADDRESS_CHANGE to modify the telephone number present in the Central Address of a BP. I coded the same in the BADI  - BUPA_ADDR_UPDATE->CHANGE_BEFORE_UPDATE but did not find any success with the same. Following is the code I used

ls_adtel-telephone = '43355266'.

ls_adtel-std_no = 'X'.

ls_adtel-r_3_user = '1'.

append ls_adtel to lt_adtel_n.

ls_adtelx-telephone = 'X'.

ls_adtelx-std_no = 'X'.

ls_adtelx-r_3_user = 'X'.

ls_adtelx-updateflag = 'U'.     * Used 'I' as well.

append ls_adtelx to lt_adtelx.

       CALL FUNCTION 'BUPA_ADDRESS_CHANGE'

         EXPORTING

           IV_PARTNER    = '100007777'

           IV_ADDRNUMBER = '0000056672'

           IV_X_SAVE     = ''

         TABLES

           IT_ADTEL      = lt_adtel_n

           IT_ADTEL_X    = lt_adtelx.

  Please help ascertain the issue here.