Index: openacs-4/packages/acs-content-repository/sql/postgresql/upgrade/upgrade-5.9.0d1-5.9.0d2.sql
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-content-repository/sql/postgresql/upgrade/upgrade-5.9.0d1-5.9.0d2.sql,v
diff -u -r1.1 -r1.1.2.1
--- openacs-4/packages/acs-content-repository/sql/postgresql/upgrade/upgrade-5.9.0d1-5.9.0d2.sql	2 May 2015 17:23:21 -0000	1.1
+++ openacs-4/packages/acs-content-repository/sql/postgresql/upgrade/upgrade-5.9.0d1-5.9.0d2.sql	21 Aug 2015 09:28:31 -0000	1.1.2.1
@@ -18,10 +18,12 @@
 
 -- 
 -- Handle latest_revision and live_revision via foreign keys
--- 
+--
+ALTER TABLE cr_items DROP CONSTRAINT IF EXISTS cr_items_latest_fk;
 ALTER TABLE cr_items ADD CONSTRAINT cr_items_latest_fk
 FOREIGN KEY (latest_revision) REFERENCES cr_revisions(revision_id);
 
+ALTER TABLE cr_items DROP CONSTRAINT IF EXISTS cr_items_live_fk;
 ALTER TABLE cr_items ADD CONSTRAINT cr_items_live_fk
 FOREIGN KEY (live_revision) REFERENCES cr_revisions(revision_id);