Service tax

ONLY Service Tax AMOUNT is not updating in database coding is :
'-----Code for Inserting one entry into t_report_servicetax - starts here----------------
dbObject.ServiceTax(Val(txtServiceNo.Text), DBClass.enumStockTransactionType.ServiceTaxEntry, DBClass.enumTransactionMode.Add)
'-----Code for Inserting one entry into t_report_servicetax - ends here----------------

DATABASE DESIGN:
bill_no entry_type sl_no typewise_sl_no entry_date doc_no service_name service_type_id credit_servicetax credit_educess credit_hecess debit_servicetax debit_educess debit_hecess balance_servicetax balance_educess balance_hecess remarks acc_no description
0 19 0 0 2012-02-01 00:00:00 0 0 0 0 0 0 0 0 958746 369854 0
2 15 1 1 2012-02-15 00:00:00 1 0 0 2 1 0 0 0 0 958748 369855 0 Bank Challan
3 15 2 2 2012-02-15 00:00:00 2 0 0 5 9 0 0 0 0 958753 369864 0 Bank Challan