add: creditnote

edocument.py

@@ -22,6 +22,19 @@ class Invoice(Invoice):
         if getattr(self.invoice, 'sales', None) is not None:
             return ', '.join([x.number for x in self.invoice.sales])
 
+    def negate_amount(self, amount):
+        """ amount * -1.0
+        """
+        if amount is not None and amount:
+            if isinstance(amount, Decimal):
+                return amount.copy_negate()
+            elif isinstance(amount, float):
+                return -1.0 * amount
+            elif isinstance(amount, int):
+                return -1 * amount
+        else :
+            return amount
+
     def prepaid_amount(self, invoice):
         """ compute already paid amount
         """
@@ -108,7 +121,12 @@ class Invoice(Invoice):
             loader = genshi.template.TemplateLoader(
                 os.path.join(os.path.dirname(__file__), 'template'),
                 auto_reload=True)
-            return loader.load(os.path.join(version, 'XRechnung.xml'))
+            if self.type_code in ['380', '389']:
+                return loader.load(os.path.join(version, 'XRechnung_invoice.xml'))
+            elif self.type_code in ['381', '261']:
+                return loader.load(os.path.join(version, 'XRechnung_credit.xml'))
+            else :
+                raise ValueError('invalid type-code "%s"' % self.type_code)
         else:
             return super(Invoice, self)._get_template(version)