SetCommand.create(editingDomain, parameter, UMLPackage.eINSTANCE.getParameter_Default(), defaultValue)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eDynamicUnset(BasicEObjectImpl.java:1208)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eDynamicUnset(BasicEObjectImpl.java:1197)
at org.eclipse.uml2.uml.internal.impl.ParameterImpl.eUnset(ParameterImpl.java:1598)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eUnset(BasicEObjectImpl.java:1156)
at org.eclipse.uml2.uml.internal.operations.ParameterOperations.unsetDefault(ParameterOperations.java:292)
at org.eclipse.uml2.uml.internal.impl.ParameterImpl.unsetDefault(ParameterImpl.java:834)
at org.eclipse.uml2.uml.internal.impl.ParameterImpl.eUnset(ParameterImpl.java:1583)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eUnset(BasicEObjectImpl.java:1156)