SAP Message WB2B191 - Inconsistent business data exists. Check data for document &1

Diagnosis
An inconsistency between the business data and the subsequent documentshas been identified when the items were checked for the consistancy.This could be because the currency was changed but only affected asingle item.

System Response
The data cannot be released.

Procedure
Check the assignments of the subsequent documents for the contractitems. Compare the assignments with the existing business data.
Compare the data for item &2 and item &3.