There are quite some use-cases in both jBPM and Drools implementations that require the used data-model to have proper "equals" and "hashCode" implementations (Drools fact insertion based on equality is an example, or ad-hoc multi-stage support in Case Management in jBPM).

The data-modeller does not provide an equals and hashCode generator, forcing a developer to implement this themselves. We need add functionality that allows users to add equals and hashcode. Generating a default implementation like, for example, Eclipse does, should be enough for now (and most use-cases I guess).