Bug 120317 Set "dimension" property to 3D in "properties" view, error appears in layout editor.
Description: Set "dimension" property to 3D in "properties" view, error appears in layout editor. Steps to reproduce: 1. Add a 2D chart in property editor. 2. Set its dimension property to "three-dimension" in properties view. 3. Error appears in chart.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ExtensionModelPropertyDefn.java
* @see org.eclipse.birt.report.model.metadata.PropertyDefn#getTypeCode()
	 */
	public int getTypeCode( )
	{
		PropertyType type = getType( );
		assert type != null;
		return type.getTypeCode( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#isIntrinsic()
	 */
	public boolean isIntrinsic( )
	{
		return false;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#isList()
	 */
	public boolean isList( )
	{
		return extProperty.isList( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#setAllowedChoices(org.eclipse.birt.report.model.metadata.ChoiceSet)