ODBC - Recordset missing value when i migrate to postgresql 8.1

I was migrated postgresql from 7.4 to 8.1.2.
It has some problem in our application,Microsoft Access, which query
data on postgresql through pgSQLODBC.

*Server *: Postgresql 8.1.2
OS : Linux Redhat 7.3
Encoding : UTF8

*Client *: Windows XP Service Pack 1,2
ODBC : PostgresODBC 8.01.0200  Unicode

*Application *: VBA on Microsoft Access
*Connection *: DAO --> ODBC

    Set gWS_ODBC = DBEngine.CreateWorkspace("ODBCWorkspace", "orssss",
"", dbUseODBC)
    'CURSOR SET (SERVER CURSOR)

    gWS_ODBC.DefaultCursorDriver = dbUseServerCursor
    'ODBC CONNECT CHARACTER

   gODBC_str =
"ODBC;DSN=DSST;DATABASE=DSST;SERVER=192.168.1.12;PORT=5432;UID=aid;PWD=drmm;"
    gODBC_str = gODBC_str & "C2=dd_;;CX=186503ab"
    Set gCON_ODBC = gWS_ODBC.OpenConnection("Connection1",
dbDriverComplete, False, gODBC_str)

*Recordset *:
          Set lTB1 = gCON_ODBC.OpenRecordset(lMYSQL1, dbOpenDynaset)
SQL :
        Select  m.Childno as Childno , 0 as act_data , '0' as org_data ,
'' as acc_whcd
        from m_part as m

The result on recordset:

         lTB1!Childno --> 'PK00302'
         lTB1!act_data --> 0
but when I get data from
         lTB1!org_data
 it show error  :
      Not positioned on a valid row for GetData.
----------------------
Next : I'm change my sql to :
SQL :
        Select  m.Childno as Childno , 0 as act_data , 0 as org_data ,
'' as acc_whcd
        from m_part as m

        i can get data from lTB1!org_data --> 0
but it has error at lTB1!acc_whcd

------------------------

I have the same problem when select some user function on postgresql.

-------------------------

I was not found this problem on
Database : postgresql 7.4
Encoding : UNICODE
ODBC : Postgresql ODBC 7.xx.xx...