diff --git a/SAS/ResourceAssignment/ResourceAssignmentDatabase/sql/create_database.sql b/SAS/ResourceAssignment/ResourceAssignmentDatabase/sql/create_database.sql
index 4fd10e0787527143fb0c2a9a0921dd53d32f055d..985594488bfeb137f4e13669336faf31e81b4cdc 100644
--- a/SAS/ResourceAssignment/ResourceAssignmentDatabase/sql/create_database.sql
+++ b/SAS/ResourceAssignment/ResourceAssignmentDatabase/sql/create_database.sql
@@ -141,8 +141,8 @@ ALTER TABLE resource_allocation.specification
 
 CREATE TABLE resource_allocation.task (
   id serial NOT NULL,
-  mom_id integer,
-  otdb_id integer,
+  mom_id integer UNIQUE,
+  otdb_id integer UNIQUE,
   status_id integer NOT NULL REFERENCES resource_allocation.task_status DEFERRABLE INITIALLY IMMEDIATE,
   type_id integer NOT NULL REFERENCES resource_allocation.task_type DEFERRABLE INITIALLY IMMEDIATE,
   specification_id integer NOT NULL REFERENCES resource_allocation.specification  ON DELETE CASCADE DEFERRABLE INITIALLY IMMEDIATE,