diff --git a/src/Marello/Bundle/SalesBundle/Entity/SalesChannel.php b/src/Marello/Bundle/SalesBundle/Entity/SalesChannel.php
index 51294f5dc..e8e10c9ac 100644
--- a/src/Marello/Bundle/SalesBundle/Entity/SalesChannel.php
+++ b/src/Marello/Bundle/SalesBundle/Entity/SalesChannel.php
@@ -400,7 +400,7 @@ public function getIntegrationChannel()
      * @param Channel $integrationChannel
      * @return $this
      */
-    public function setIntegrationChannel(Channel $integrationChannel)
+    public function setIntegrationChannel(Channel $integrationChannel = null)
     {
         $this->integrationChannel = $integrationChannel;
 
diff --git a/src/Marello/Bundle/SalesBundle/Migrations/Schema/MarelloSalesBundleInstaller.php b/src/Marello/Bundle/SalesBundle/Migrations/Schema/MarelloSalesBundleInstaller.php
index 359036121..4edbc9d0c 100644
--- a/src/Marello/Bundle/SalesBundle/Migrations/Schema/MarelloSalesBundleInstaller.php
+++ b/src/Marello/Bundle/SalesBundle/Migrations/Schema/MarelloSalesBundleInstaller.php
@@ -17,7 +17,7 @@ class MarelloSalesBundleInstaller implements Installation
      */
     public function getMigrationVersion()
     {
-        return 'v1_2';
+        return 'v1_3';
     }
 
     /**
@@ -73,7 +73,6 @@ protected function createMarelloSalesSalesChannelTable(Schema $schema)
         $table->addColumn('integration_channel_id', 'integer', ['notnull' => false]);
         $table->setPrimaryKey(['id']);
         $table->addUniqueIndex(['code'], 'marello_sales_sales_channel_codeidx');
-        $table->addUniqueIndex(['integration_channel_id'], 'UNIQ_75C456C9F5B7AF7511');
         $table->addIndex(['owner_id'], 'idx_37c71d17e3c61f9', []);
     }
     
diff --git a/src/Marello/Bundle/SalesBundle/Migrations/Schema/v1_3/MarelloSalesBundle.php b/src/Marello/Bundle/SalesBundle/Migrations/Schema/v1_3/MarelloSalesBundle.php
new file mode 100644
index 000000000..f668a56ef
--- /dev/null
+++ b/src/Marello/Bundle/SalesBundle/Migrations/Schema/v1_3/MarelloSalesBundle.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Marello\Bundle\SalesBundle\Migrations\Schema\v1_3;
+
+use Doctrine\DBAL\Schema\Schema;
+use Oro\Bundle\MigrationBundle\Migration\Migration;
+use Oro\Bundle\MigrationBundle\Migration\QueryBag;
+
+/**
+ * @SuppressWarnings(PHPMD.TooManyMethods)
+ * @SuppressWarnings(PHPMD.ExcessiveClassLength)
+ */
+class MarelloSalesBundle implements Migration
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function up(Schema $schema, QueryBag $queries)
+    {
+        /** Tables generation **/
+        $this->modifyMarelloSalesSalesChannelTable($schema);
+    }
+
+    /**
+     * @param Schema $schema
+     */
+    protected function modifyMarelloSalesSalesChannelTable(Schema $schema)
+    {
+        $table = $schema->getTable('marello_sales_sales_channel');
+        if ($table->hasIndex('UNIQ_75C456C9F5B7AF7511')) {
+            $table->dropIndex('UNIQ_75C456C9F5B7AF7511');
+        }
+    }
+
+}