There's a FAQ about it but it's in French. So here's the way in English :
- get the ID of your invoice (invoice is called "facture" in French). You can get this ID by going to the Invoice's card, and check the address in your browser. For example
dolibarr.xxxxx.com/compta/facture.php?facid=29 the invoice ID is "29"
- connect to your database (via phpmyadmin or command line, for example)
- Type the following commands (replace INVOICE_ID by the ID you got earlier):
- DELETE FROM llx_facturedet WHERE fk_facture = INVOICE_ID;
- DELETE FROM llx_facture WHERE rowid = INVOICE_ID;
Your invoice should be deleted successfully.
Alban