diff --git a/lib/NGCP/Schema/Result/voip_pbx_groups.pm b/lib/NGCP/Schema/Result/voip_pbx_groups.pm
index 03a94db0..3af8ae70 100644
--- a/lib/NGCP/Schema/Result/voip_pbx_groups.pm
+++ b/lib/NGCP/Schema/Result/voip_pbx_groups.pm
@@ -33,6 +33,13 @@ __PACKAGE__->add_columns(
     is_foreign_key => 1,
     is_nullable => 0,
   },
+  "subscriber_id",
+  {
+    data_type => "integer",
+    extra => { unsigned => 1 },
+    is_foreign_key => 1,
+    is_nullable => 0,
+  },
   "number_id",
   {
     data_type => "integer",
@@ -76,6 +83,13 @@ __PACKAGE__->belongs_to(
   { is_deferrable => 1, on_delete => "CASCADE", on_update => "CASCADE" },
 );
 
+__PACKAGE__->belongs_to(
+  "provisioning_voip_subscriber",
+  "NGCP::Schema::Result::provisioning_voip_subscribers",
+  { id => "subscriber_id" },
+  { is_deferrable => 1, on_delete => "CASCADE", on_update => "CASCADE" },
+);
+
 __PACKAGE__->has_many(
   "provisioning_voip_subscribers",
   "NGCP::Schema::Result::provisioning_voip_subscribers",