diff --git a/k4ever/transaction/models.py b/k4ever/transaction/models.py
index 5108374..e5bab0f 100644
--- a/k4ever/transaction/models.py
+++ b/k4ever/transaction/models.py
@@ -6,6 +6,7 @@ from django.db.models.deletion import SET_NULL
 from django.db.models.signals import pre_delete
 from decimal import Decimal
 
+from validator import validate_notZero
 
 class TransactionType(models.Model):
 	""" Type for a :class:`Transaction`. States how the money has
@@ -22,7 +23,7 @@ class Transaction(models.Model):
 	user = models.ForeignKey(User)
 	transactionType = models.ForeignKey(TransactionType, verbose_name='Typ')
 	dateTime = models.DateTimeField(auto_now_add=True)
-	amount = models.DecimalField(max_digits=8, decimal_places=2, validators=[MinValueValidator(Decimal("0.01"))])
+	amount = models.DecimalField(max_digits=8, decimal_places=2, validators=[validate_notZero])
 	checked = models.BooleanField(default=False)
 
 	
diff --git a/k4ever/transaction/validator.py b/k4ever/transaction/validator.py
new file mode 100644
index 0000000..d704ab8
--- /dev/null
+++ b/k4ever/transaction/validator.py
@@ -0,0 +1,7 @@
+from django.core.exceptions import ValidationError
+from decimal import Decimal
+
+
+def validate_notZero(value):
+	if value == Decimal("0.0") :
+		raise ValidationError(u'%s is not an real number\{0.00}' % value)