Hi Ahmed,

You can do it by creating a computed Many2one field:

invoice_id = fields.Many2one(comodel_name='account.invoice', string="Invoice", compute="_get_invoice", )
@api.one
@api.depends('WHATEVER FIELDS TO BE USED IN THE CALCULATIONS')
def _get_invoice(self):
     '''
     Add all the calculations and the logic needed hear to get the ID of the invoice
     '''
     self.invoice_id = ID_THAT_YOU_HAVE

This will fill the field in the view with invoice, it will be shown as a link by default.