diff --git a/sale.py b/sale.py
index 201b0c3..3e51620 100644
--- a/sale.py
+++ b/sale.py
@@ -208,6 +208,8 @@ class Sale(metaclass=PoolMeta):
                 authorization_id = sale.shop.pos_authorization.id
             elif sale.invoice_type == 'M' and sale.shop.manual_authorization:
                 authorization_id = sale.shop.manual_authorization.id
+            elif sale.invoice_type == 'C' and sale.shop.computer_authorization:
+                authorization_id = sale.shop.computer_authorization.id
             elif sale.invoice_type in ['1', '2', '3'] and sale.shop.electronic_authorization:
                 authorization_id = sale.shop.electronic_authorization.id
             elif sale.shop.debit_note_electronic_authorization and sale.invoice_type == '92':