diff --git a/db/update20.0.beta2.sql b/db/update20.0.beta2.sql
index 5c731d6f40..f396086421 100644
--- a/db/update20.0.beta2.sql
+++ b/db/update20.0.beta2.sql
@@ -21,3 +21,5 @@ UPDATE `zt_chart` SET `sql` = 'SELECT t1.id, t1.NAME AS project, IFNULL( t2.NAME
 UPDATE `zt_grouppriv` SET `method` = 'recordWorkhour' WHERE `module` = 'task' AND `method` = 'recordEstimate';
 UPDATE `zt_grouppriv` SET `method` = 'editEffort'     WHERE `module` = 'task' AND `method` = 'editEstimate';
 UPDATE `zt_grouppriv` SET `method` = 'deleteWorkhour' WHERE `module` = 'task' AND `method` = 'deleteEstimate';
+
+ALTER TABLE `zt_demandreview` CHANGE `reviewDate` `reviewDate` datetime NULL;
diff --git a/db/updateipdinstall.sql b/db/updateipdinstall.sql
index c7a57e3939..a99442f5f1 100644
--- a/db/updateipdinstall.sql
+++ b/db/updateipdinstall.sql
@@ -72,7 +72,7 @@ CREATE TABLE `zt_demandreview` (
   `version` smallint(6) NOT NULL DEFAULT '0',
   `reviewer` varchar(30) NOT NULL DEFAULT '',
   `result` varchar(30) NOT NULL DEFAULT '',
-  `reviewDate` datetime NOT NULL
+  `reviewDate` datetime NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 CREATE UNIQUE INDEX `demand` ON `zt_demandreview`(`demand`,`version`,`reviewer`);
 
diff --git a/db/zentao.sql b/db/zentao.sql
index 0f9c8e9c66..0c431e9004 100755
--- a/db/zentao.sql
+++ b/db/zentao.sql
@@ -15817,7 +15817,7 @@ CREATE TABLE `zt_demandreview` (
   `version` smallint(6) NOT NULL DEFAULT '0',
   `reviewer` varchar(30) NOT NULL DEFAULT '',
   `result` varchar(30) NOT NULL DEFAULT '',
-  `reviewDate` datetime NOT NULL
+  `reviewDate` datetime NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 CREATE UNIQUE INDEX `demand` ON `zt_demandreview`(`demand`,`version`,`reviewer`);