unit cost is 0 for this item dynamic Nav 2009 r2 why

Hi guys i have problem.

I have item this item related to spare parts item

This item transaction type is purchase and we can adjustment from item journal

Negative adjustment or positive adjustment

I make adjust cost item entries but until now cost per unit is 0 and cost amount(actual) is 0

why this and How to prevent this from repeated .

To show what found in screen shoot

I go to item card item button entries value Entries

see the red line this is problem

why this line found and how to solve

I export the result in excel file as following :