diff --git a/datamodels/2.x/installation.xml b/datamodels/2.x/installation.xml
index bfe9bf0215..aa7d9d75b4 100755
--- a/datamodels/2.x/installation.xml
+++ b/datamodels/2.x/installation.xml
@@ -7,6 +7,7 @@
       <banner>/images/modules.png</banner>
       <options type="array">
         <choice>
+          <extension_code>itop-config-mgmt-core</extension_code>
           <title>Configuration Management Core</title>
           <description>All the base objects that are mandatory in the iTop CMDB: Organizations, Locations, Teams, Persons, etc.</description>
           <modules type="array">
@@ -19,6 +20,7 @@
           <mandatory>true</mandatory>
         </choice>
         <choice>
+          <extension_code>itop-config-mgmt-datacenter</extension_code>
           <title>Data Center Devices</title>
           <description>Manage Data Center devices such as Racks, Enclosures, PDUs, etc.</description>
           <modules type="array">
@@ -27,6 +29,7 @@
           <default>true</default>
         </choice>
         <choice>
+          <extension_code>itop-config-mgmt-end-user</extension_code>
           <title>End-User Devices</title>
           <description>Manage devices related to end-users: PCs, Phones, Tablets, etc.</description>
           <modules type="array">
@@ -35,6 +38,7 @@
            <default>true</default>
         </choice>
         <choice>
+          <extension_code>itop-config-mgmt-storage</extension_code>
           <title>Storage Devices</title>
           <description>Manage storage devices such as NAS, SAN Switches, Tape Libraries and Tapes, etc.</description>
           <modules type="array">
@@ -43,6 +47,7 @@
           <default>true</default>
         </choice>
         <choice>
+          <extension_code>itop-config-mgmt-virtualization</extension_code>
           <title>Virtualization</title>
           <description>Manage Hypervisors, Virtual Machines and Farms.</description>
           <modules type="array">
@@ -58,6 +63,7 @@
       <banner>./wizard-icons/service.png</banner>
       <alternatives type="array">
         <choice>
+          <extension_code>itop-service-mgmt-enterprise</extension_code>
           <title>Service Management for Enterprises</title>
           <description>Select this option if the IT delivers services based on a shared infrastructure. For example if different organizations within your company subscribe to services (like Mail and Print services) delivered by a single shared backend.</description>
           <modules type="array">
@@ -66,6 +72,7 @@
           <default>true</default>
         </choice>
         <choice>
+          <extension_code>itop-service-mgmt-service-provider</extension_code>
           <title>Service Management for Service Providers</title>
           <description>Select this option if the IT manages the infrastructure of independent customers. This is the most flexible model, since the services can be delivered with a mix of shared and customer specific infrastructure devices.</description>
           <modules type="array">
@@ -80,6 +87,7 @@
       <banner>./itop-incident-mgmt-itil/images/incident-escalated.png</banner>
       <alternatives type="array">
         <choice>
+          <extension_code>itop-ticket-mgmt-simple-ticket</extension_code>
           <title>Simple Ticket Management</title>
           <description>Select this option to use one single type of tickets for all kind of requests.</description>
           <modules type="array">
@@ -89,6 +97,7 @@
           <sub_options>
             <options type="array">
               <choice>
+                <extension_code>itop-ticket-mgmt-simple-ticket-enhanced-portal</extension_code>
                 <title>Enhanced Customer Portal</title>
                 <description>Replace the built-in customer portal with a more modern version, working better with hand-held devices and bringing new features</description>
                 <modules type="array">
@@ -101,11 +110,13 @@
           </sub_options>
         </choice>
         <choice>
+          <extension_code>itop-ticket-mgmt-itil</extension_code>
           <title>ITIL Compliant Tickets Management</title>
           <description>Select this option to have different types of ticket for managing user requests and incidents. Each type of ticket has a specific life cycle and specific fields</description>
           <sub_options>
             <options type="array">
               <choice>
+                <extension_code>itop-ticket-mgmt-itil-user-request</extension_code>
                 <title>User Request Management</title>
                 <description>Manage User Request tickets in iTop</description>
                 <modules type="array">
@@ -113,6 +124,7 @@
                 </modules>
               </choice>
               <choice>
+                <extension_code>itop-ticket-mgmt-itil-incident</extension_code>
                 <title>Incident Management</title>
                 <description>Manage Incidents tickets in iTop</description>
                 <modules type="array">
@@ -120,6 +132,7 @@
                 </modules>
               </choice>
               <choice>
+                <extension_code>itop-ticket-mgmt-itil-enhanced-portal</extension_code>
                 <title>Enhanced Customer Portal</title>
                 <description>Replace the built-in customer portal with a more modern version, working better with hand-held devices and bringing new features</description>
                 <modules type="array">
@@ -132,6 +145,7 @@
           </sub_options>
         </choice>
         <choice>
+          <extension_code>itop-ticket-mgmt-none</extension_code>
           <title>No Tickets Management</title>
           <description>Don't manage incidents or user requests in iTop</description>
           <modules type="array">
@@ -145,6 +159,7 @@
       <banner>./itop-change-mgmt/images/change.png</banner>
       <alternatives type="array">
         <choice>
+          <extension_code>itop-change-mgmt-simple</extension_code>
           <title>Simple Change Management</title>
           <description>Select this option to use one type of ticket for all kind of changes.</description>
           <modules type="array">
@@ -153,6 +168,7 @@
           <default>true</default>
         </choice>
         <choice>
+          <extension_code>itop-change-mgmt-itil</extension_code>
           <title>ITIL Change Management</title>
           <description>Select this option to use Normal/Routine/Emergency change tickets.</description>
           <modules type="array">
@@ -160,6 +176,7 @@
           </modules>
         </choice>
         <choice>
+          <extension_code>itop-change-mgmt-none</extension_code>
           <title>No Change Management</title>
           <description>Don't manage changes in iTop</description>
           <modules type="array">
@@ -173,6 +190,7 @@
       <banner>./itop-knownerror-mgmt/images/known-error.png</banner>
       <options type="array">
         <choice>
+          <extension_code>itop-kown-error-mgmt</extension_code>
           <title>Known Errors Management</title>
           <description>Select this option to track "Known Errors" and FAQs in iTop.</description>
           <modules type="array">
@@ -180,6 +198,7 @@
           </modules>
         </choice>
         <choice>
+          <extension_code>itop-problem-mgmt</extension_code>
           <title>Problem Management</title>
           <description>Select this option track "Problems" in iTop.</description>
           <modules type="array">