Update Item Cost w/Last Purchase Price FMS

I would like to update the Item Cost in the Item Master(Inventory Data Tab) with Last Purchase Price using a formatted search for items that end in 'NI'.  What is the actual query for this?  Also would like it to "refresh regularly"

My query(not working):

SELECT distinct T0.[ItemCode]+'NI', T0.[AvgPrice], T0.[LastPurPrc] FROM OITM WHERE T0.[ItemCode]+'NI' = $[$38.1.0]

Please advise.

Thank you