Item costs are zero and not reflecting in cost center reports

Hi,

I am using SAP B1, and when i check the items in item list, the cost shows zero (0), but in item master data, the price is there, when i issue items in issue wizard, the cost is zero(0), but when i check the issue history in audit report, the prices are shown.
Now the problem comes, in cost center reports, the reports seem to only pick other expenses from other accounts, but the report does not show any parts issued, so trucks seem to have no maintenance, just other expenses. Please assist, i cant seem to find solutions online.

thanks