diff --git a/l10n_ar_sale_order_type/models/sale_order.py b/l10n_ar_sale_order_type/models/sale_order.py
index 56bd7229..96382884 100644
--- a/l10n_ar_sale_order_type/models/sale_order.py
+++ b/l10n_ar_sale_order_type/models/sale_order.py
@@ -29,8 +29,9 @@ def write(self, vals):
                         record.state in {"draft", "sent"}
                         and record.type_id.sequence_id != sale_checkbook.sequence_id
                     ):
+                        number_next = sale_checkbook.sequence_id.number_next_actual
                         new_vals = vals.copy()
-                        new_vals["name"] = sale_checkbook.sequence_id._next() or _('New')
+                        new_vals["name"] = sale_checkbook.sequence_id.get_next_char(number_next)
                         super(SaleOrder, record).write(new_vals)
                     else:
                         super(SaleOrder, record).write(vals)