diff --git a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
index 01028b3e680..462e6c000ba 100644
--- a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
+++ b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
@@ -188,13 +188,15 @@ ALTER TABLE llx_projet ADD COLUMN accept_booth_suggestions integer DEFAULT 0;
 ALTER TABLE llx_projet ADD COLUMN price_registration double(24,8);
 ALTER TABLE llx_projet ADD COLUMN price_booth double(24,8);
 
-ALTER TABLE llx_actioncomm ADD COLUMN ref varchar(30);
-ALTER TABLE llx_actioncomm ADD COLUMN num_vote integer;
-ALTER TABLE llx_actioncomm ADD COLUMN event_paid smallint NOT NULL DEFAULT 0;
-ALTER TABLE llx_actioncomm ADD COLUMN status smallint NOT NULL DEFAULT 0;
+ALTER TABLE llx_actioncomm ADD COLUMN num_vote integer DEFAULT NULL AFTER reply_to;
+ALTER TABLE llx_actioncomm ADD COLUMN event_paid smallint NOT NULL DEFAULT 0 AFTER num_vote;
+ALTER TABLE llx_actioncomm ADD COLUMN status smallint NOT NULL DEFAULT 0 AFTER event_paid;
 
 # TODO manage ref into cationcomm class
-ALTER TABLE llx_actioncomm ADD COLUMN ref varchar(255);
+ALTER TABLE llx_actioncomm ADD COLUMN ref varchar(255) AFTER id;
+UPDATE llx_actioncomm SET ref = id WHERE ref = '' OR ref IS NULL;
+ALTER TABLE llx_actioncomm MODIFY COLUMN ref varchar(30) NOT NULL;
+ALTER TABLE llx_actioncomm ADD UNIQUE INDEX uk_actioncomm_ref (ref, entity);
 
 ALTER TABLE llx_c_actioncomm MODIFY code varchar(50) NOT NULL;
 ALTER TABLE llx_c_actioncomm MODIFY module varchar(50) DEFAULT NULL;
diff --git a/htdocs/install/mysql/tables/llx_actioncomm.key.sql b/htdocs/install/mysql/tables/llx_actioncomm.key.sql
index 64fbe874fc2..ee16386c7c4 100644
--- a/htdocs/install/mysql/tables/llx_actioncomm.key.sql
+++ b/htdocs/install/mysql/tables/llx_actioncomm.key.sql
@@ -17,7 +17,6 @@
 --
 -- ===========================================================================
 
-
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_fk_soc (fk_soc);
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_fk_contact (fk_contact);
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_code (code);
@@ -27,5 +26,6 @@ ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_fk_project (fk_project);
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_datep (datep);
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_datep2 (datep2);
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_recurid (recurid);
-
 ALTER TABLE llx_actioncomm ADD INDEX idx_actioncomm_ref_ext (ref_ext);
+
+ALTER TABLE llx_actioncomm ADD UNIQUE INDEX uk_actioncomm_ref (ref, entity);
diff --git a/htdocs/install/mysql/tables/llx_actioncomm.sql b/htdocs/install/mysql/tables/llx_actioncomm.sql
index a29d50646bc..0dbb4e1d1a7 100644
--- a/htdocs/install/mysql/tables/llx_actioncomm.sql
+++ b/htdocs/install/mysql/tables/llx_actioncomm.sql
@@ -73,7 +73,7 @@ create table llx_actioncomm
   recurrule         varchar(128),					-- contains string with ical format recurring rule like 'FREQ=MONTHLY;INTERVAL=2;BYMONTHDAY=19' or 'FREQ=WEEKLY;BYDAY=MO'
   recurdateend      datetime,						-- no more recurring event after this date
 
-  num_vote          integer          ,              -- use for Event Organization module
+  num_vote          integer DEFAULT NULL,          -- use for Event Organization module
   event_paid        smallint NOT NULL DEFAULT 0,    -- use for Event Organization module
   status            smallint NOT NULL DEFAULT 0,    -- use for Event Organization module for now, but could be use after for event global status