Cannot create a record in General journal entry (GeneralJournalEntry). Date: .The record already exists.

Hi - I am facing problem in posting Vendor Invoice Journal, System give following error and Journal becomes locked by system

Cannot create a record in General journal entry (GeneralJournalEntry). Date: .The record already exists.

Anybody have expereince or can suggest solution for this problem? We are useing Dynamics AX 2012 with Cumulative update 2.

Thanks