Balance: (SELECT SUM([InvoiceAmt]-[PaymentAmt])
FROM
tblTrans WHERE
tblTrans.Date<=btblTrans.Date
AND tblTrans.TnxNo<=btblTrans.TnxNo
AND tblTrans.CustomerID=btblTrans.CustomerID)
Condition is work & Getting the correct figure, But Cannot use its for report coz it's not a permanent field
Pls help me to Correct the cording to keep this is a permanent field