Field is empty in SSRS - InventValueReport

Hi everyone , 
First I add field - Description   in table -  InventValueReportTmpLine .After this I add field - Description in InventValueReportDP ->getInventValueReportTmpLine like this:

I add also and this in InventValueReportPopulateItem -> findReportLine 

tmpReportLine.Description       = InventTable::find(_inventTable.ItemId).defaultProductDescription();

When I debugged it looks okei


but when run Report from Ax View ->nventory management/Reports/Inventory value /Inventory value
FIELD IS EMPTY ?

Can anyone help me :)