SAP Message UCFI021 - Item for crcy translation difference is missing for item &1/prod.group &2

Diagnosis
You specified a comparative exchange rate indicator in the task forelimination of IU profit/loss in inventory. The system uses thisindicator to translate the inventory and supplier data separately, andto determine any difference to the same data when translated accordingto the currency translation method. This difference is posted to anitem you define in Customizing.
The system could not find an item for translation differences forinventory item &V1& and product group &V2&.

System Response
Processing terminated

Procedure
Define the items for currency translation differences in theelimination of IU P/L in inventory.