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I want to add custom product attribute to sales order grid, and here is my code below,

$collection = Mage::getResourceModel($this->_getCollectionClass())
$vendor1_total = Mage::getResourceModel('catalog/product')->getAttribute('vendor1_total');
 $collection->getSelect()
            ->join(array('ce1' => 'catalog_product_entity_varchar'), 'ce1.entity_id=main_table.product_id', array('vendor1_total' => 'value'))
            ->where('ce1.attribute_id=' . $vendor1_total->getAttributeId())

            ->columns(new Zend_Db_Expr("CONCAT(`ce1`.`value`"));

and Im getting Unknown column error, and query is,

SELECT COUNT(*) FROM `sales_flat_order_grid` AS `main_table`
 INNER JOIN `sales_flat_order_address` AS `soas` ON soas.parent_id=main_table.entity_id and soas.address_type = "shipping"
 INNER JOIN `sales_flat_order_item` AS `sales/order_item` ON `sales/order_item`.order_id=`main_table`.entity_id
 INNER JOIN `catalog_product_entity_varchar` AS `ce1` ON ce1.entity_id=sales_flat_order_item.product_id
 LEFT JOIN `sales_flat_order` AS `order` ON order.entity_id=main_table.entity_id

Of course the error is correct, there is no column name of product_id in sales_flat_order_grid . But I tried to replace the table name - main_table with sales_flat_order_item where the column is exist. But still its taking old table main_table - sales_flat_order_grid. So I want to changes this main_table to sales_flat_order_item (If it will not affect other parts) or how to use this table sales_flat_order_item to fetch my column into grid. Please help me.

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