Tenant datasource helper missing

Hi,

I am running a multi tenant environment with three tenants. When I go to
"webtools/control/ConnectionPoolStatus" I can only see 3 lines

Helper name: ofbizolap_demo1
Helper name: ofbiz_demo1
Helper name: demotenant (tenant data source)

The helpers for the two other tenants are missing. The log shows lots of:
"There is no datasource (Helper) configured for the entity-group
[org.ofbiz.tenant];"

All tenants seem to work fine. Data stored in the right database, no
problems in the front end...
On Start-Up: Delegator "default#demo2" NOT initializing helper for entity
group "org.ofbiz.tenant" because the group is not associated to this
delegator.

Entity setup of all tenants is identical:

<delegator name="default" entity-model-reader="main"
entity-group-reader="main" entity-eca-reader="main"
distributed-cache-clear-enabled="false">
<group-map group-name="org.ofbiz.tenant" datasource-name="demotenant"/>
<group-map group-name="org.ofbiz" datasource-name="ofbiz_demo1"/>
<group-map group-name="org.ofbiz.olap" datasource-name="ofbizolap_demo1"/>
<group-map group-name="org.ofbiz" datasource-name="ofbiz_demo2"/>
<group-map group-name="org.ofbiz.olap" datasource-name="ofbizolap_demo2"/>
<group-map group-name="org.ofbiz" datasource-name="ofbiz_demo3"/>
<group-map group-name="org.ofbiz.olap" datasource-name="ofbizolap_demo3"/>
</delegator>

Using 13.07., MySQL

Thanks for any hint,
Ingo