CICS and WEBSPHERE 6.02 : how to call a specific transaction?

[deck80]

Hi all,
I'm quite new at using CICS.
I'm trying to call a transaction through CICS. I have my configuration file in xml that looks like

<Service>
<CICSJ2CEci Name="cics" UseService="CICSTPT" ProgramName="PTRBF24S" TransactionName="F240" Transaction="NO">
<ConnectorInput DataSetName="INPUT"/>
<ConnectorOutput DataSetName="OUTPUT"/>
</CICSJ2CEci>
</Service>

The service CICSTPT is configured with a JNDI name
eis/CTGTPTBBS
and with SERVERNAME, CONNECTIONURL and PORTNUMBER valorized.

With this configuration the transaction goes ABEND, because the system needs to call the right transaction to set connections with DB2 and whatever...
The program name is correct but having not recognized the name, it uses the default transaction, which is not the right one.
If I write the transaction name in TranName field on the custom settings in the online configurator it works.
Provided that I don't want to make a service for each transaction, do you have any idea on how to overcome the problem?
If you need more elements and info ask me.
Thank you for your time...