diff --git a/lib/NGCP/Schema.pm b/lib/NGCP/Schema.pm
index 70c2a54d..ad04ff4a 100644
--- a/lib/NGCP/Schema.pm
+++ b/lib/NGCP/Schema.pm
@@ -7,7 +7,7 @@ use Regexp::IPv6 qw($IPv6_re);
 use MooseX::ClassAttribute qw(class_has);
 extends 'DBIx::Class::Schema';
 
-our $VERSION = '1.005';
+our $VERSION = '1.006';
 
 __PACKAGE__->load_namespaces;
 
diff --git a/lib/NGCP/Schema/Result/provisioning_voip_subscribers.pm b/lib/NGCP/Schema/Result/provisioning_voip_subscribers.pm
index 5dfb1ad9..4e654db9 100644
--- a/lib/NGCP/Schema/Result/provisioning_voip_subscribers.pm
+++ b/lib/NGCP/Schema/Result/provisioning_voip_subscribers.pm
@@ -424,6 +424,13 @@ __PACKAGE__->has_one(
   { cascade_copy => 0, cascade_delete => 0 },
 );
 
+__PACKAGE__->belongs_to(
+  "contract",
+  "NGCP::Schema::Result::contracts",
+  { 'foreign.id' => 'self.account_id' },
+  { cascade_copy => 0, cascade_delete => 0 },
+);
+
 
 __PACKAGE__->meta->make_immutable;
 1;