Lot Costing, Need Price Code to Pull Last Item Cost

Using Lot Costing here for our Inventory Costing.

I have all price codes set up - but for those pulling from cost, it's pulling from the Standard Cost (as it should) - BUT I need it to pull from the Last Item Cost.

How can I change this? Each individual item is unique in it's cost, we do Standard Cost Adjustments once a month to update.... 

HELP!