Updating a process definition

I'm trying to add a new process context variable to an existing process.
Several instances of the existing process exist in our Shark workflow
system.
 
I updated the XPDL, and went to the PackageManagement tab in the Shark
Admin and selected the package and pressed update.  Now, my
PackageManagement tab shows two processes with the same name but
different version numbers.
 
I went to the ProcessInstantiationManagement tab and see both versions.
I select the new version and instantiate it.  When I go to the
ProcessMonitor tab, I see my newly instantiated process with the new
variable.  So far, so good.
 
But, the only difference between the two on my Admin screens is the
version number.  In my programming code, I'm calling 
workflowConnection.createProcess(package_id, process_id);
 
Then, when I try to set the new variable on the map, I get an error
org.enhydra.shark.api.client.wfmodel.InvalidData 

This is the same error I would get if the process did not have the
variable defined.  I assume my call to  createProcess() is still
creating the old one.  How do I get it to instantiate a process using
the new definition?  I can't unload the old version because there are
processes using it that are still not finished.

Thanks for any advice,

Greg
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