diff --git a/k4ever/transaction/admin.py b/k4ever/transaction/admin.py
index 4b3fc05..4de287f 100644
--- a/k4ever/transaction/admin.py
+++ b/k4ever/transaction/admin.py
@@ -6,9 +6,11 @@
 #
 # Licensed under GNU Affero General Public License v3 or later
 
-from models import Transaction, TransactionType, VirtualTransaction
 from django.contrib import admin
 
+from transaction.models import Transaction, TransactionType, VirtualTransaction
+
+
 class TransactionAdmin(admin.ModelAdmin):
 	list_filter = ('transactionType','checked','user')
 	#actions = ['really_delete_selected']
diff --git a/k4ever/transaction/forms.py b/k4ever/transaction/forms.py
index 0526ce4..3405b9d 100644
--- a/k4ever/transaction/forms.py
+++ b/k4ever/transaction/forms.py
@@ -7,11 +7,13 @@
 # Licensed under GNU Affero General Public License v3 or later
 
 from django import forms
-from models import Transaction, VirtualTransaction
-from main.fields import CurrencyField
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
 
+from main.fields import CurrencyField
+from transaction.models import Transaction, VirtualTransaction
+
+
 class TransactionForm(forms.ModelForm):
 	""" ModelForm for :class:`Transactions <Transaction>` with a currency field. """
 	amount = CurrencyField(label='Betrag')
diff --git a/k4ever/transaction/models.py b/k4ever/transaction/models.py
index c14c012..72e1150 100644
--- a/k4ever/transaction/models.py
+++ b/k4ever/transaction/models.py
@@ -6,16 +6,17 @@
 #
 # Licensed under GNU Affero General Public License v3 or later
 
-
-from django.db import models
-from django.core.validators import *
-from django.contrib.auth.models import User
-from django.db.models.deletion import SET_NULL
-from django.db.models.signals import pre_delete
 from decimal import Decimal
 
+from django.core.validators import MinValueValidator
+from django.contrib.auth.models import User
+from django.db import models
+from django.db.models.deletion import SET_NULL
+from django.db.models.signals import pre_delete
+
 from validator import validate_notZero
 
+
 class TransactionType(models.Model):
 	""" Type for a :class:`Transaction`. States how the money has
 	    been added to the account and if somebody needs to check
diff --git a/k4ever/transaction/urls.py b/k4ever/transaction/urls.py
index f898434..600c0b1 100644
--- a/k4ever/transaction/urls.py
+++ b/k4ever/transaction/urls.py
@@ -5,7 +5,7 @@
 #
 # Licensed under GNU Affero General Public License v3 or later
 
-from django.conf.urls.defaults import *
+from django.conf.urls.defaults import patterns
 
 
 urlpatterns = patterns('',
diff --git a/k4ever/transaction/validator.py b/k4ever/transaction/validator.py
index 03c5703..b9abd93 100644
--- a/k4ever/transaction/validator.py
+++ b/k4ever/transaction/validator.py
@@ -5,9 +5,10 @@
 #
 # Licensed under GNU Affero General Public License v3 or later
 
-from django.core.exceptions import ValidationError
 from decimal import Decimal
 
+from django.core.exceptions import ValidationError
+
 
 def validate_notZero(value):
 	if value == Decimal("0.0") :
diff --git a/k4ever/transaction/views.py b/k4ever/transaction/views.py
index 54bc963..8166347 100644
--- a/k4ever/transaction/views.py
+++ b/k4ever/transaction/views.py
@@ -5,14 +5,15 @@
 #
 # Licensed under GNU Affero General Public License v3 or later
 
-from django.shortcuts import render_to_response
-from django.template import RequestContext
 from django.contrib.auth.decorators import login_required
 from django.db.models import Q
 from django.http import HttpResponseRedirect
-from models import Transaction, TransactionType, VirtualTransaction
-from forms import TransactionForm, VirtualTransactionForm
-import datetime
+from django.shortcuts import render_to_response
+from django.template import RequestContext
+
+from transaction.forms import TransactionForm, VirtualTransactionForm
+from transaction.models import Transaction, VirtualTransaction
+
 
 @login_required
 def overview(request):