CmmnActivity parent = context.getParent();
String sentryId = sentry.getId();
CmmnSentryDeclaration sentryDeclaration = parent.getSentry(sentryId);
PlanItem source = onPart.getSource();
PlanItemTransition standardEvent = onPart.getStandardEvent();
if (source != null && standardEvent != null) {
CmmnOnPartDeclaration onPartDeclaration = new CmmnOnPartDeclaration();
// initialize standardEvent
String standardEventName = standardEvent.name();
onPartDeclaration.setStandardEvent(standardEventName);
// initialize sourceRef
String sourceId = source.getId();
CmmnActivity sourceActivity = parent.findActivity(sourceId);