Database table update issue

Hello experts, Need your Help...
I am trying to update database table using Update command. And I am doing COMMIT WORK AND WAIT. after the successful update.
But my code sometimes does not work and the table is not updated.
Sometimes the code works and sometimes not.. for the same data.
Can anybody think of any possible reason?
Thanks in advance,
--Kumail

Hello Guys,
Here is the code, here we have all the keys... as it updates correctly sometimes. But doesnt update sometimes... for same data...... I have added COMMITT and WAIT statements to solve this problem.... but no luck....
        UPDATE zfxx_bsr_data
            SET zfxxstatus_glr = zfxx_bsr_data-zfxxstatus_glr
            zfxxstatus_issue = zfxx_bsr_data-zfxxstatus_issue
                zfxxerdat_glr   = sy-datum
                zfxxuser_glr    = sy-uname
                zfxxremark_glr = zfxx_bsr_data-zfxxremark_glr
                zfxxertime_glr = sy-uzeit
              doc_ind         = w_doc_ind
              zfxx_attach_acc = w_zfxx_att_acc
          WHERE bukrs        EQ t001-bukrs
          AND   saknr        EQ zfxx_bsr_data-saknr
          AND   zfxxperiod   EQ zfxx_bsr_data-zfxxperiod
          AND   zfxxfield    EQ c_ba
          AND   zfxxfieldval EQ tgsb-gsber.
        IF sy-subrc EQ 0.
          WAIT UP TO 3 SECONDS.
          COMMIT WORK.
          WAIT UP TO 3 SECONDS.
        ENDIF.

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