From 55fe4ab796b8ff66bc42a53ee0f5fd8f1140ebba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rolv=20R=C3=A5en=20rora=40adego=2Eno?= <>
Date: Tue, 19 Apr 2011 12:17:34 +0200
Subject: [PATCH] Added support for Norwegian VAT no

bzr revid: rora@adego.no-20110419101734-c8q8sb2aku83y1sg
---
 addons/base_vat/base_vat.py | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/addons/base_vat/base_vat.py b/addons/base_vat/base_vat.py
index 102619e876d..2ddcada9399 100644
--- a/addons/base_vat/base_vat.py
+++ b/addons/base_vat/base_vat.py
@@ -39,7 +39,7 @@ _ref_vat = {
     'pt': 'PT123456789', 'ro': 'RO1234567897',
     'se': 'SE123456789701', 'si': 'SI12345679',
     'sk': 'SK0012345675', 'el': 'EL12345670',
-    'mx': 'MXABC123456T1B'
+    'mx': 'MXABC123456T1B', 'no': 'NO123456785'
 
             }
 
@@ -1077,6 +1077,33 @@ class res_partner(osv.osv):
         elif len(vat)==13 and not vat[:4].isalpha() | vat[4:10].isdigit() | vat[-3:].isalnum():
             return False
         return True
+    
+    def check_vat_no(self, vat):
+        '''
+        Check Norway VAT number.
+        '''
+        if len(vat) != 9:
+            return False
+        try:
+            int(vat)
+        except:
+            return False
+
+        sum = (3 * int(vat[0])) + (2 * int(vat[1])) + \
+            (7 * int(vat[2])) + (6 * int(vat[3])) + \
+            (5 * int(vat[4])) + (4 * int(vat[5])) + \
+            (3 * int(vat[6])) + (2 * int(vat[7])) 
+        
+        check = 11 -(sum % 11)
+        if check == 11:
+            check = 0
+        if check == 10:
+            check -1
+            return False
+        if check != int(vat[8]):
+            return False
+        return True    
+    
 res_partner()
 
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