From 4eb7daf0220b28005a485d7e287cde0babf9fb76 Mon Sep 17 00:00:00 2001
From: Sergi Almacellas Abellana <sergi@koolpi.com>
Date: Mon, 27 Nov 2017 16:51:06 +0100
Subject: [PATCH] Do not raise missing accounts errors on readonly transactions

issue6913
review42811002
---
 product.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/product.py b/product.py
index 0ea26ebad2..7ed09d5aa3 100644
--- a/product.py
+++ b/product.py
@@ -28,7 +28,8 @@ def account_used(field_name):
             account = func(self)
             if not account:
                 account = self.get_account(field_name + '_used')
-            if not account:
+            # Allow empty values on on_change
+            if not account and not Transaction().readonly:
                 self.raise_user_error('missing_account', {
                         'name': self.name,
                         'id': self.id,