Message SAP WU215 - Item currency & could not be converted to promotion currency &

Diagnosis
The item value at purchase price could not be addedto the details value for the promotion, because conversioninto the different currencies of the item and promotion headerfailed. No suitable conversion factor was found.

System Response
The purchase price and purchase currency are not accepted andwill be called up on the screen again for making corrections.

Procedure
Maintain the conversion factor between both the currencies or setanother purchase price currency.