[rules-users] How do I configure the constraints for a Split node in Drools Flow to test the value of a process variable?

I have a requirement for a simple rule flow containing a "status" process variable; a work item sets the value of this variable via its Result Mapping. Following the work item is an XOR Split node, which can go to one of two following nodes, depending on the value of the status process variable. The relevant sections from the rule flow definition, as currently written, are as follows: <header> <variables> <variable name="status" > <type name="org.drools.process.core.datatype.impl.type.StringDataType" /> </variable> ... </variables> </header> <nodes> ... <workItem id="4" name="Test work item" x="352" y="52" width="80" height="40" > <work name="TestItem" > </work> <mapping type="out" from="status" to="status" /> </workItem> ... <split id="9" name="Split" x="464" y="52" width="80" height="40" type="2" > <constraints> <constraint toNodeId="10" toType="DROOLS_DEFAULT" name="error" priority="1" type="code" dialect="java" <constraint toNodeId="8" toType="DROOLS_DEFAULT" name="success" priority="1" type="code" dialect="java" </constraints> </split> ... </nodes> The Java code that implements the "TestItem" work item finishes with the code: Map<String, Object> results = new HashMap<String, Object>(); results.put("status", status); // Value of status can be "success" or "error" ksession.getWorkItemManager().completeWorkItem(stepInstance.getWorkItemId(), results); When I execute this process, no matter what the value of the status result returned by the work item, the node with ID 8 (the 'success' path) always executes. I hope it's clear what I'm trying to do (i.e. define a process variable, sets its value using the result from a work item, and then test its value in a Split node); can anyone help me out as to why it's not working? (Incidentally, this is Drools v5.1M1.) Many thanks, Alan