diff --git a/k4ever/main/fields.py b/k4ever/main/fields.py
index 32a1baa..ec865de 100644
--- a/k4ever/main/fields.py
+++ b/k4ever/main/fields.py
@@ -23,7 +23,7 @@ class CurrencyField (forms.RegexField):
 			self.currencyRe, None, None, *args, **kwargs)
 	def to_python(self, value):
 		try:
-			value = Decimal(value)
+			value = Decimal(value.replace(",", "."))
 		except (ValueError, TypeError, InvalidOperation):
 			raise ValidationError("Bitte gib eine Zahl ein")
 		return value
diff --git a/k4ever/transaction/forms.py b/k4ever/transaction/forms.py
index 6ce8859..1b86444 100644
--- a/k4ever/transaction/forms.py
+++ b/k4ever/transaction/forms.py
@@ -18,7 +18,8 @@ class TransactionForm(forms.ModelForm):
 	def clean(self):
 		# needed to enforce TransactionTypes needsCheck "default value"
 		cleaned_data = super(TransactionForm, self).clean()
-		self.instance.checked = not cleaned_data['transactionType'].needsCheck
+		if cleaned_data.has_key("transactionType"):
+			self.instance.checked = not cleaned_data['transactionType'].needsCheck
 		return cleaned_data
 
 class VirtualTransactionForm(forms.ModelForm):