>You always must check the result of SQLEXEC(), try this and tell us the result:

>    text to lcSql noshow
>         update acc_mf
>            set ob_dr = ob_dr + ?lnObDr,
>                ob_cr = ob_cr + ?lnObCr
>          where ac_level < '5'
>            and ac_no = ?lcAcNo
>      endtext
>      IF SQLExec(hConn, lcSql) < 0
>         AERROR(laError)
>         MessageBox([Can not update table ] +laError[1,2])
>      ENDIF
......

SQLExec() is running without any problem. SQLExec() Returns 1 when I run it. I think COMMIT has to do with this, But on backend setting is Autocommit, which is Default behaviour of SQL Server.
As I said it DOES update the records but only 1 level up per execution.
When I run it 2nd time, again 1 level up and so on.