When you check your data, you can see the following error:

'Account (customer or supplier account) index is duplicated'.

To correct this error, follow the steps below.

NOTE: If no errors are returned and records appear to be duplicated in v28.1 of the software, refer to our alternative article.

1. If the error relates to a blank record, try to delete the record.
2. Go to Recovery Tools, when prompted, follow the instructions and create a data backup.
3. Select Reindex and Compress All, then press OK.
4. Select Recalculate Transaction History, then press OK.
5. Select Recalculate Period Values, then press OK.
6. Press Close.
7. When prompted to check the data again, press Yes.
8. If the error persists, check if it references a blank customer or supplier account.
   
   If it does, delete the blank account and run Check Data again.
   
   If the error is still present, you must restore an error free backup and re-process.

Next steps

• I have other errors, warnings or comments
• I've removed all errors and warnings