[6.0] module point of sale wizard pos.box.out

file wizard/pos_box_out.py

The field product_id links to a product.product instance (check function _get_expense_product in same file)
'product_id': fields.selection(_get_expense_product, "Operation", required=True),

but in the function get_out we have:

        product_obj = self.pool.get('product.template')
        productp_obj = self.pool.get('product.product')
        res_obj = self.pool.get('res.users')
        for data in self.read(cr, uid, ids, context=context):
##############################
some code
##############################
            amount_check = productp_obj.browse(cr, uid, data['product_id'], context=context).am_out or False
##############################
some other code
##############################
            acc_id = product_obj.browse(cr, uid, data['product_id'], context=context).property_account_income

so data['product_id'] is sometimes used as a product.product id and sometimes like a product.template.

(but this is supposed to be a product.product id)