I'm seeing the same bug here on Eclipse 4.5.2 and BPMN2 modeler 1.2.3.
Also tried renaming the .wid file to WorkItemDefinitions.wid and updating the reference in 'drools.rulebase.conf' to
drools.workDefinition = WorkItemDefinitions.wid
Without any effect sadly. Same problem in another environment with Eclipse Mars and BPMN2 Plugin v1.2.1.
EDIT: Updated typo in version: 1.2.3-Final version of the plugin.
Robert Brodt Messages: 811 Registered: August 2010 Location: Colorado Springs, CO
Yes, this is a known issue (please see https://bugs.eclipse.org/bugs/show_bug.cgi?id=488221) and we're working feverishly on fixing this. The editor does not pay attention to the drools.rulebase.conf file, so it will not find your wid files referenced therein. In the meantime, please make sure the wid file is located in the root of your Eclipse project directory.