ADO Error - Method 'Execute' of object '_Command' failed

While executing a UPDATE query through ADO i am getting an error message
Run time error '-2147217887 (80040e21)':
Method 'Execute of object '-command' failed.

I am using
 NT 4 OS with SP4, VB6
 ADO object Library 2.1
 Oracle Server & Client 8.1.7

Tips
----
a) While command object executes this error prompted.
b) When i use adInteger instead of adBigInt datatype,
   this error is not encountered.
c) The same adBigInt datatypes working without any error
   in Oracle Server and client 8.0.6
d) Why this Oracle 8.1.7 is not accepted ?

Thanks in advance

===== Function ========
Public Function UpdateFPAPara_Approve(ByVal apv_by_id As String, ByVal apv_flag As String, ByVal apv_dt As Date, ByVal fpa_para_apvcd As Long) As Integer
   
    On Error GoTo ERR_HANDLER
   
    Dim lcm As ADODB.Command
    Set lcm = New ADODB.Command
    lcm.ActiveConnection = GetConnection
   
    lcm.CommandType = adCmdText
    lcm.Prepared = True
 
    lcm.CommandText = "update FPA_PARA_APPROVE set apv_by_id = ?, approve_fl = ?, approve_dt = ? where fpa_para_apvcd = ?"
   
    lcm.Parameters.Append GetNewParameter(adVarChar, 20, apv_by_id)
    lcm.Parameters.Append GetNewParameter(adVarChar, 20, apv_flag)
    lcm.Parameters.Append GetNewParameter(adDBTimeStamp, , CDate(apv_dt))
    lcm.Parameters.Append GetNewParameter(adBigInt, , fpa_para_apvcd)
       
    lcm.Execute
    UpdateFPAPara_Approve = 1

    Set lcm = Nothing
    Exit Function
   
ERR_HANDLER:
    UpdateFPAPara_Approve = 0
    Set lcm = Nothing
    MsgBox Err.Description, vbCritical, "FPA-cdFPAPara Class"
End Function