slapos_subscription_request: Subscription Request is not a Subscription Item

The Subscription Item is Hosting Subscription, so it only acts as a "requester".

master/bt5/slapos_subscription_request/PortalTypePropertySheetTemplateItem/property_sheet_list.xml

@@ -6,6 +6,7 @@
   <item>Url</item>
  </portal_type>
  <portal_type id="Subscription Request">
+  <item>Amount</item>
   <item>CredentialRequest</item>
   <item>HostingSubscription</item>
   <item>Person</item>

master/bt5/slapos_subscription_request/PortalTypeTemplateItem/portal_types/Subscription%20Request.xml

@@ -52,7 +52,7 @@
         </item>
         <item>
             <key> <string>type_class</string> </key>
-            <value> <string>SubscriptionItem</string> </value>
+            <value> <string>XMLObject</string> </value>
         </item>
         <item>
             <key> <string>type_interface</string> </key>

master/bt5/slapos_subscription_request/bt/template_portal_type_property_sheet_list

@@ -2,6 +2,7 @@ Subscription Condition | HostingSubscription
 Subscription Condition | SoftwareInstance
 Subscription Condition | TextDocument
 Subscription Condition | Url
+Subscription Request | Amount
 Subscription Request | CredentialRequest
 Subscription Request | HostingSubscription
 Subscription Request | Person