Forum Post: Cannot write to SO_SalesOrderTaxSummary

The following code gives the message "Cannot add records to SO_SalesOrderTaxSummary." Why not? Set oSOSalesOrderTaxSummary = oScript.NewObject("SO_SalesOrderTaxSummary_bus", oSS) retVal = oSOSalesOrderTaxSummary.nSetKeyValue("SalesOrderNo$", "0000045") retVal = oSOSalesOrderTaxSummary.nSetKeyValue("ScheduleSeqNo$", "000001") retVal = oSOSalesOrderTaxSummary.nSetKeyValue("TaxCode$", "DEFAULT") retVal = oSOSalesOrderTaxSummary.nSetKey() MsgBox(oSOSalesOrderTaxSummary.sLastErrorMsg) retVal = oSOSalesOrderTaxSummary.nSetValue("SalesTaxAmt", 3.00) retVal = oSOSalesOrderTaxSummary.nWrite()