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jBPM provides an example:

https://github.com/droolsjbpm/jbpm/blob/master/jbpm-examples/src/main/resources/multipleinstance/multipleinstance.bpmn

https://github.com/droolsjbpm/jbpm/blob/master/jbpm-examples/src/main/java/org/jbpm/examples/multipleinstance/MultipleInstanceExample.java

docs: http://docs.jboss.org/jbpm/v5.3/userguide/ch.core-basics.html#d0e1926

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• VariableName: The name of the variable to contain the current element from the collection. This gives nodes within the composite node access to the selected element.

you should be able to insert <VariableName> into the WM to be evaluated by rules.

In Designer you can specify both the Collection Expression and the Variable Name properties.

HTH