I would like to change the invoice sequence from INV/%(range_year)% to something else (say ABC/INV/%(range_year)%. 

This is my code:

.py file

class AccountMove(models.Model):

     _inherit = 'account.move'
    @api.model 

    def create(self, vals):

         if vals.get('name', ('New')) == ('New'): 

            vals['name'] = self.env['ir.sequence'].next_by_code('account.invoice.sequence') or                     ('New') 

            record = super(AccountMove, self).create(vals)

     return record

.xml file

Invoice Sequence
account.invoice.sequence
ABC/INV/%(y)s/




4

This changed the invoice sequence format but the problem is it keeps generating invoice number even in draft state. How to solve this?