when adding new values to field list getting error

[omerdavid]

I am trying to add supplier column to the BO order tab and to to the order report which is being generated from the order table ,while folowing the solution that were regarding this topic

 https://www.prestashop.com/forums/topic/275522-solved-add-backoffice-columns-products-list/

https://www.prestashop.com/forums/topic/276546-how-to-add-an-extra-column-in-orders-table/

but when i am trying to add new values to the field list like products and supplier there is an error : 'Unknown column'

$this->fields_list = array(
			   'id_order' => array(
				'title' => $this->l('ID'),
				'align' => 'text-center',
				'class' => 'fixed-width-xs'
			),
            'products' => array(
                'title'=> $this->l('products')
            ),
			'reference' => array(
				'title' => $this->l('Reference')
			),
			'new' => array(
				'title' => $this->l('New client'),
				'align' => 'text-center',
				'type' => 'bool',
				'tmpTableFilter' => true,
				'orderby' => false
			),
			'customer' => array(
				'title' => $this->l('Customer'),
				'havingFilter' => true,
			),
           'supplier' => array(
               'title'=> $this->l('supplier')
           ),


		);

Edited July 13, 2015 by omerdavid (see edit history)