Hi
Have you tried to Publish page 397 in Web Services?
Extra info:
Original Cost: has a direct relationship with "Unit Cost" of lines in Sales Invoice. If in your example you look at Unit Cost in line then you will see the same cost (since you have one line only). The unit cost populate from Item Card. Which is calculation from Item Ledger Entry.
Adjusted Cost: this is when you run "Adjust Cost- Item Entries". In a nutshell, this is a process that analyzes the Item Ledger Entries to ensure that all cost layers are accurately applied to sales (and other negative entries), thereby ensuring that the Inventory Valuation and Cost of Goods Sold entries posted within NAV are accurate. if any changes required between the time sales invoice created and after running "Adjust Cost - Item Entries" then it will reflect here.
The rest are calculation based on these calculation.