problems on writing data in a oracle db via recordset

[macl]

hi everybody i have a problem
i have a programme that gets data from a oracle database and also should write data into the database
now i get the datas with a recordset like that

GetData SQLUserData, adOpenForwardOnly, recData

function GetData()
'setting the recordset
Set GetData1 = New ADODB.Recordset

'execute the SQL-Query
GetData1.Open strSQL, conDB, strCursortype, adLockBatchOptimistic

Set rsOutput = GetData1
-----
The strSQL contains the sql-query
that works so far but if i want to write data into that recordset with

recData.Fields(4) = Date
recData.UpdateBatch
recData.Close

then i get this message:

"Current Recordset does not support updating. This may be a limitation of the provider, or of the selected locktype"


does somebody know what is the problem here and how i can solve that?
thanks a real lot