Error: Cannot create a record in . The record already exists

Thanks to Amer Atiyah.....:)
Source : Amer Atiyah's Blog

Sometimes you might face an unexpected error when trying to insert new records to any of the Dynamics AX tables. The message you might have is like: Cannot create a record in Journal lines (LedgerJournalTrans). The record already exists.

You might also have tried to check the indexes of this table that shouldn’t be duplicated. And you got surprised when you are not violating those constraints, so there is no any rational reason why this error might appear.

After so many tries, I got to fix that error by:

1. Backing-up my database (just in case that anything went wrong)
2. Exporting the data of that table (from the AX Import/Export functionality)
3. Deleting/Dropping the table from the Microsoft SQL Server Management Studio (by this all the data of course will be deleted)
4. Opening the Dynamics AX client, going to: AOT –> Data Dictionary –> Tables –> LedgerJournalTrans –> Right clieck –> Synchronize
5. Importing the data again to all companies (from the AX Import/Export functionality.

As you could see, I got this error in a very critical table that is the LedgerJournalTrans table. This table contained already posted lines and it was really headache for me to get it fixed. But fortunately I was able to fix it by following the previous steps.