Job usage for items

Is job appl. area an integrated part of Navision Financials/Attain? 1. I post a PO as receipt without invoice → cost of item = 0 2. I post a job usage for this item in job journal Navision makes a job entry and a negative adj. item ledger entry with cost of 0. 3. I post PO as invoice → direct cost= 100 4. I run the adjust cost - item entries batch job, It adjusts posted negative item adj., but job entry doesn’t. How can be modified this wrong job cost? Thanks for any help! Soya