From feb45513f77962cc4b58334385afb66bcadc9141 Mon Sep 17 00:00:00 2001
From: Oliver <oliver.henry.walters@gmail.com>
Date: Sun, 29 Apr 2018 13:20:02 +1000
Subject: [PATCH] Prevent serial number for stock item with quantity > 1

---
 InvenTree/part/models.py           | 2 +-
 InvenTree/static/css/inventree.css | 4 ++++
 InvenTree/stock/models.py          | 7 +++++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 236649214f..9740d1ccc3 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -82,7 +82,7 @@ class Part(models.Model):
     """ Represents an abstract part
     Parts can be "stocked" in multiple warehouses,
     and can be combined to form other parts
-    """
+    """        
 
     def get_absolute_url(self):
         return '/part/{id}/'.format(id=self.id)
diff --git a/InvenTree/static/css/inventree.css b/InvenTree/static/css/inventree.css
index 229ee025e6..d007287f89 100644
--- a/InvenTree/static/css/inventree.css
+++ b/InvenTree/static/css/inventree.css
@@ -85,4 +85,8 @@
 .wrapper {
     align-items: stretch;
     display: flex;
+}
+
+.help-inline {
+    color: #A11;
 }
\ No newline at end of file
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index e2a3dc4f82..5f415cd8d9 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -73,6 +73,13 @@ class StockItem(models.Model):
             # TODO - Find a test than can be perfomed...
             pass
 
+        # Serial number cannot be set for items with quantity greater than 1
+        if not self.quantity == 1 and self.serial:
+            raise ValidationError({
+                'quantity': _("Quantity must be set to 1 for item with a serial number"),
+                'serial': _("Serial number cannot be set if quantity > 1")
+            })
+
     def get_absolute_url(self):
         return '/stock/item/{id}/'.format(id=self.id)