diff --git a/backend/lib/Controller/Channel.php b/backend/lib/Controller/Channel.php
index 034bb2f..df6ddaa 100644
--- a/backend/lib/Controller/Channel.php
+++ b/backend/lib/Controller/Channel.php
@@ -27,19 +27,18 @@ class Channel extends Controller {
 	
 	// TODO authentification/indentification
 	public function get() {
-		$dql = 'SELECT c FROM Volkszaehler\Model\Channel\Channel c JOIN WHERE';
+		$dql = 'SELECT c FROM Volkszaehler\Model\Channel c';
 
-		$conditions = array();
 		if ($this->view->request->getParameter('uuid')) {
-			$conditions['uuid'] = $this->view->request->getParameter('uuid');
+			// TODO add conditions
 		}
 		
 		if ($this->view->request->getParameter('ugid')) {
-			
+			// TODO add conditions
 		}
 		
 		if ($this->view->request->getParameter('indicator')) {
-			
+			// TODO add conditions
 		}
 		
 		$q = $this->em->createQuery($dql);
diff --git a/backend/lib/Controller/Data.php b/backend/lib/Controller/Data.php
index f650194..d781470 100644
--- a/backend/lib/Controller/Data.php
+++ b/backend/lib/Controller/Data.php
@@ -21,12 +21,15 @@
 
 namespace Volkszaehler\Controller;
 
+// TODO call as subcontroller from Controller\Channel::get()?
 class Data extends Controller {
+	
+	// TODO authentification/indentification
 	public function get() {
 		// TODO why not ucids?
 		$ids = explode(',', trim($this->view->request->getParameter('ids')));
 		
-		$q = $this->em->createQuery('SELECT c FROM Volkszaehler\Model\Channel\Channel c WHERE c.id IN (' . implode(', ', $ids) . ')');
+		$q = $this->em->createQuery('SELECT c FROM Volkszaehler\Model\Channel c WHERE c.id IN (' . implode(', ', $ids) . ')');
 		$channels = $q->execute();
 		
 		$from = ($this->view->request->getParameter('from')) ? (int) $this->view->request->getParameter('from') : NULL;
@@ -35,7 +38,7 @@ class Data extends Controller {
 	
 		foreach ($channels as $channel) {
 			$interpreter = $channel->getInterpreter($this->em);
-			$this->view->add($interpreter->getValues($from, $to, $groupBy));
+			$this->view->add($channel, $interpreter->getValues($from, $to, $groupBy));
 		}
 	}
 	
diff --git a/backend/lib/Interpreter/Interpreter.php b/backend/lib/Interpreter/Interpreter.php
index 7925caf..a332956 100644
--- a/backend/lib/Interpreter/Interpreter.php
+++ b/backend/lib/Interpreter/Interpreter.php
@@ -35,7 +35,7 @@ abstract class Interpreter implements InterpreterInterface {
 	/*
 	 * constructor
 	 */
-	public function __construct(\Volkszaehler\Model\Channel\Channel $channel, \Doctrine\ORM\EntityManager $em) {
+	public function __construct(\Volkszaehler\Model\Channel $channel, \Doctrine\ORM\EntityManager $em) {
 		$this->channel = $channel;
 		$this->em = $em;
 	}
diff --git a/backend/lib/Model/Channel.php b/backend/lib/Model/Channel.php
index 689098a..894ebeb 100644
--- a/backend/lib/Model/Channel.php
+++ b/backend/lib/Model/Channel.php
@@ -29,7 +29,7 @@ use Doctrine\Common\Collections\ArrayCollection;
  * @Entity
  * @Table(name="channels")
  */
-abstract class Channel extends Entity {
+class Channel extends Entity {
 	/** @Column(type="string") */
 	protected $name;
 
@@ -47,7 +47,7 @@ abstract class Channel extends Entity {
 	/** @Column(type="integer") */
 	private $resolution;
 
-	/** @Column(type="decimal") */
+	/** @Column(type="decimal", precision="5", scale="2") */
 	private $cost;
 	
 	/*
diff --git a/backend/lib/Model/Proxies/VolkszaehlerModelChannelProxy.php b/backend/lib/Model/Proxies/VolkszaehlerModelChannelProxy.php
new file mode 100644
index 0000000..24c63a7
--- /dev/null
+++ b/backend/lib/Model/Proxies/VolkszaehlerModelChannelProxy.php
@@ -0,0 +1,123 @@
+<?php
+
+namespace Volkszaehler\Model\Proxies;
+
+/**
+ * THIS CLASS WAS GENERATED BY THE DOCTRINE ORM. DO NOT EDIT THIS FILE.
+ */
+class VolkszaehlerModelChannelProxy extends \Volkszaehler\Model\Channel implements \Doctrine\ORM\Proxy\Proxy
+{
+    private $_entityPersister;
+    private $_identifier;
+    public $__isInitialized__ = false;
+    public function __construct($entityPersister, $identifier)
+    {
+        $this->_entityPersister = $entityPersister;
+        $this->_identifier = $identifier;
+    }
+    private function _load()
+    {
+        if (!$this->__isInitialized__ && $this->_entityPersister) {
+            $this->__isInitialized__ = true;
+            if ($this->_entityPersister->load($this->_identifier, $this) === null) {
+                throw new \Doctrine\ORM\EntityNotFoundException();
+            }
+            unset($this->_entityPersister);
+            unset($this->_identifier);
+        }
+    }
+
+    
+    public function addData(\Volkszaehler\Model\Data $data)
+    {
+        $this->_load();
+        return parent::addData($data);
+    }
+
+    public function getInterpreter(\Doctrine\ORM\EntityManager $em)
+    {
+        $this->_load();
+        return parent::getInterpreter($em);
+    }
+
+    public function getName()
+    {
+        $this->_load();
+        return parent::getName();
+    }
+
+    public function setName($name)
+    {
+        $this->_load();
+        return parent::setName($name);
+    }
+
+    public function getDescription()
+    {
+        $this->_load();
+        return parent::getDescription();
+    }
+
+    public function setDescription($description)
+    {
+        $this->_load();
+        return parent::setDescription($description);
+    }
+
+    public function getUnit()
+    {
+        $this->_load();
+        return parent::getUnit();
+    }
+
+    public function getIndicator()
+    {
+        $this->_load();
+        return parent::getIndicator();
+    }
+
+    public function getResolution()
+    {
+        $this->_load();
+        return parent::getResolution();
+    }
+
+    public function setResolution($resolution)
+    {
+        $this->_load();
+        return parent::setResolution($resolution);
+    }
+
+    public function getCost()
+    {
+        $this->_load();
+        return parent::getCost();
+    }
+
+    public function setCost($cost)
+    {
+        $this->_load();
+        return parent::setCost($cost);
+    }
+
+    public function getId()
+    {
+        $this->_load();
+        return parent::getId();
+    }
+
+    public function getUuid()
+    {
+        $this->_load();
+        return parent::getUuid();
+    }
+
+
+    public function __sleep()
+    {
+        if (!$this->__isInitialized__) {
+            throw new \RuntimeException("Not fully loaded proxy can not be serialized.");
+        }
+        return array('name', 'description', 'indicator', 'data', 'resolution', 'cost', 'id', 'uuid');
+    }
+}
\ No newline at end of file