add danish_vat field to creditnote model and template

src/shop/migrations/0051_creditnote_danish_vat.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-09-17 12:59
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('shop', '0050_auto_20170916_1336'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='creditnote',
+            name='danish_vat',
+            field=models.BooleanField(default=True, help_text='Danish VAT?'),
+        ),
+    ]

src/shop/models.py

@@ -410,6 +410,11 @@ class CreditNote(CreatedUpdatedModel):
         default='',
     )
 
+    danish_vat = models.BooleanField(
+        help_text="Danish VAT?",
+        default=True
+    )
+
     paid = models.BooleanField(
         verbose_name=_('Paid?'),
         help_text=_('Whether the amount in this creditnote has been paid back to the customer.'),
@@ -447,7 +452,10 @@ class CreditNote(CreatedUpdatedModel):
 
     @property
     def vat(self):
-        return Decimal(self.amount*Decimal(0.2))
+        if self.danish_vat:
+            return Decimal(round(self.amount*Decimal(0.2), 2))
+        else:
+            return 0
 
     @property
     def filename(self):

src/shop/templates/pdf/creditnote.html

@@ -30,7 +30,11 @@
 
   <tr>
     <td align="right">
+      {% if creditnote.danish_vat %}
       <strong>Danish VAT (25%)</strong>
+      {% else %}
+      <strong>No VAT</strong>
+      {% endif %}
     <td align="right">
       {{ creditnote.vat|currency }}