<DataSource
    ID="filteredAggregation_orderItem"
    serverType="sql"
    tableName="dynRepOrderItem"
>
    <fields>
        <field name="orderID" type="integer" />
        <field name="orderDate" type="date" />
        <field name="itemID" type="integer" foreignKey="supplyItem.itemID" primaryKey="true" />
        <field name="quantity" type="integer" />
        <field name="itemName" includeFrom="supplyItem.itemName" />
        <field name="SKU" includeFrom="supplyItem.SKU" />
        <field name="unitCost" includeFrom="supplyItem.unitCost" format="#,##0.00" />
        <field name="totalSales" type="float" format="#,##0.00"
               customSelectExpression="quantity * supplyItem.unitCost" />
    </fields>
    
    <operationBindings>
        <operationBinding operationId="summary" operationType="fetch">
            <groupBy>itemID,itemName,SKU,unitCost</groupBy>
            <summaryFunctions>
                <quantity>sum</quantity>
                <totalSales>sum</totalSales>
            </summaryFunctions>
        </operationBinding>
    </operationBindings>
    
</DataSource>