EL Error in touchz

[Kashif Hussain]

Hi,

Follwing are parts of my workflow.xml :

-------------------
<configuration>
                <property>
                 <name>success_file</name>
                 <value>${DataPath}/aggStatus/${today}</value>
                </property>
          </configuration>

--------------------------------------------
                <start to="checkAggStatus"/>

                <decision name="checkAggStatus">
                        <switch>

                        <case to="end">
              ${fs:exists('${success_file}')}
            </case>

                        <default to="AggregateResponeData"/>
                         </switch>
                </decision>

----------------------------------------------------
<fs>
            <touchz path='${success_file}'/>
        </fs>

I am getting "EL_ERROR variable [success_file] cannot be resolved " at the
touchz command but not at fs:exists.
Why is it so ?

I have tried without quotes,with quotes or with double quotes.But nothing
seems to work.
Please help.

Regards,
Kashif