Equipment Work Order - Inventory Issue - Item Unit cost

Hi

How to setup the item unit cost, because in Equipment work order once the parts are defined and then when we issue the inventory the system is creating a batch type N with a batch number and inside it it the g/l entries but the g/l entries doesn't have amount. I checked the item ledger it has no unit cost.

The estimated costs are specified in the parts tab of the work order.

How to set up the item unit cost so that the system will multiply the issued quantity with the unit cost and get the amount in the g/l entries batch(type N).