From ad0a7bebdfc9a824afb4b65452806dfea9afd0dc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Sat, 21 Apr 2018 12:55:59 +0200
Subject: [PATCH] Use getattr on Reference field

The Reference field can have a negative id and so it does not have a value for
all columns.

issue7378
review47371002
---
 stock.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/stock.py b/stock.py
index edff36465c..1e8fbb0741 100644
--- a/stock.py
+++ b/stock.py
@@ -186,7 +186,9 @@ class Move:
             name=name)
         # Enforce the same unit category as they are used to compute the
         # remaining quantity to ship and the quantity to invoice.
-        if isinstance(self.origin, SaleLine) and self.origin.unit:
+        # Use getattr as reference field can have negative id
+        if (isinstance(self.origin, SaleLine)
+                and getattr(self.origin, 'unit', None)):
             category = self.origin.unit.category.id
         return category