I have make an upgrade from 1.4.10 to 1.5.1 and I have found some invoices which were duplicated.
Have a look :
Those duplicates have the same invoice ID (on the front-end link for example)
But phpmyadmin, I don’t see any duplicate on the ip_invoice table
I didn’t try to delete one duplicate in case of deleting all the occurence.
What sould I do ?