diff --git a/workflow/engine/config/schema.xml b/workflow/engine/config/schema.xml
index 7e344aaf7..59b7345c2 100755
--- a/workflow/engine/config/schema.xml
+++ b/workflow/engine/config/schema.xml
@@ -59,6 +59,15 @@
         <parameter name="Comment" value=""/>
       </vendor>
     </index>
+    <index name="indexAppNumber">
+      <index-column name="APP_NUMBER"/>
+      <vendor type="mysql">
+        <parameter name="Table" value="APPLICATION"/>
+        <parameter name="Non_unique" value="1"/>
+        <parameter name="Key_name" value="indexAppNumber"/>
+        <parameter name="Seq_in_index" value="1"/>
+      </vendor>
+    </index>
   </table>
   <table name="APP_DELEGATION">
     <vendor type="mysql">
diff --git a/workflow/engine/data/mysql/schema.sql b/workflow/engine/data/mysql/schema.sql
index f1475dfeb..08771c673 100755
--- a/workflow/engine/data/mysql/schema.sql
+++ b/workflow/engine/data/mysql/schema.sql
@@ -29,7 +29,8 @@ CREATE TABLE `APPLICATION`
 	`APP_DATA` MEDIUMTEXT  NOT NULL,
 	`APP_PIN` VARCHAR(32) default '' NOT NULL,
 	PRIMARY KEY (`APP_UID`),
-	KEY `indexApp`(`PRO_UID`, `APP_STATUS`, `APP_UID`)
+	KEY `indexApp`(`PRO_UID`, `APP_STATUS`, `APP_UID`),
+	KEY `indexAppNumber`(`APP_NUMBER`)
 )ENGINE=MyISAM  DEFAULT CHARSET='utf8' COMMENT='The application';
 #-----------------------------------------------------------------------------
 #-- APP_DELEGATION