TTCN-3 transformation fails for DNSExample

Try to transform DNSTester.tdltx

  EOL: /epsilon/ttcn3/ttcn3mapping.etl : 266 : Cannot invoke "org.eclipse.emf.ecore.EStructuralFeature.isOrdered()" because "sf" is null
	at (bundleentry://2567.fwk57671730/epsilon/ttcn3/ttcn3mapping.etl@266:14-266:62)
	at (bundleentry://2567.fwk57671730/epsilon/ttcn3/ttcn3mapping.etl@266:4-274:5)
	at (unknown@0:0-0:0)
	at (bundleentry://2567.fwk57671730/epsilon/ttcn3/ttcn3mapping.etl@1:0-997:1)

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