Tax Jurisdiction Codes automatically populate on Sales order

Hi All,

I have done one enhancement implementation inside MV45AFZZ user exit under . I updated the XVBADR-TXJCD by using modify statement. But after that if i will see in sales order screen then the value is not updating. Still it is showing the previous value not the updated value. Please give me some suggestion which I can solve my Problem.

My Code:

CLEAR: xvbpa, xvbadr.

READ TABLE xvbpa WITH KEY parvw = 'WE'.

IF sy-subrc = 0.

  READ TABLE xvbadr WITH KEY adrnr = xvbpa-adrnr.

  IF sy-subrc = 0.

    xvbadr-txjcd = 'CA00'.

    xvbadr-updkz = 'U'.

    MODIFY xvbadr INDEX sy-tabix.

  ENDIF.

ENDIF.

Thanks,

Satya