MySQL Запрос не выделение всех строк

Question

У меня проблема со следующим запросом. Строки из s1_pm_po_item, которые не имеют значения для s1_pm_po_item.CostCode, не выбраны. Что мне здесь не хватает?

SELECT s1_pm_po_item.id, s1_pm_costcode.CostCode AS CostCode, s1_pm_po_item.description AS Description, CONCAT( s1_pm_po_item.QtyOrdered, s1_pm_po_item_units.description ) AS QtyOrdered, FORMAT( s1_pm_po_item.UnitPrice, 2 ) AS UnitPrice, FORMAT( QtyOrdered * UnitPrice, 2 ) AS Amount
FROM s1_pm_po_item
INNER JOIN s1_pm_budget_class ON s1_pm_budget_class.id = s1_pm_po_item.CostCode
INNER JOIN s1_pm_budget_item ON s1_pm_budget_item.id = s1_pm_budget_class.BudgetItem
INNER JOIN s1_pm_costcode ON s1_pm_costcode.id = s1_pm_budget_item.CostCode
INNER JOIN s1_pm_po_item_units ON s1_pm_po_item_units.id = s1_pm_po_item.QtyUnit
WHERE s1_pm_po_item.POID =924