diff --git a/script/sql/create/33.dma.sql b/script/sql/create/33.dma.sql
index 4644a11..9dd7b51 100644
--- a/script/sql/create/33.dma.sql
+++ b/script/sql/create/33.dma.sql
@@ -1,6 +1,6 @@
 create table region_dma
 (
   id text primary key references region(id)
-, parent text references region_dma(id)
-, nodes text not null
+, parent text --references region_dma(id)
+, nodes text not null default ''
 );