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WarningStructureOMG BPMN 2.0 §10.3.3
serviceTaskImplementation
<serviceTask> / <businessRuleTask> should declare an implementation hook (standard implementation attribute, Camunda delegate / class / expression / decisionRef, or Zeebe taskDefinition).
Full reference documentation for serviceTaskImplementationis in progress. In the meantime, the rule's summary above describes the check, and the source implementation in lib/bpmn/rules/* on GitHub is the canonical specification.
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