there is a dot where it should not be. I formatted your SQL using the online formatter at www.sqlinform.com
Code:
SELECT
APPS.CST_ITEM_COST_TYPE_V.Item_number,
APPS.CST_ITEM_COST_TYPE_V.Description,
APPS.CST_ITEM_COST_TYPE_V.Cost_Type,
APPS.CST_ITEM_COST_TYPE_V.Item_Cost
FROM
APPS.CST_ITEM_COST_TYPE_V
INNER JOIN
(SELECT
Item_Number,
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