Bug 138562 Splite extendsexcpetion to seperate sub class
The suggestion is Parent invalid Cycle extends Different type extends Not top level extends
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
*/
	public Object getLocalProperty( Module module, String propName )
	{
		ElementPropertyDefn prop = getPropertyDefn( propName );
		if ( prop == null )
			return null;
		return getLocalProperty( module, prop );
	}
	/**
	 * Gets a property value given its definition. This version checks only this
	 * one object. That is, it gets the "local" property value. The property
	 * name must also be valid for this object.
	 * <p>
	 * Part of: Property value system.
	 * 
	 * @param module
	 *            the module
	 * @param prop
	 *            The property definition.
	 * @return The property value, or null if no value is set.
	 */
	public Object getLocalProperty( Module module, ElementPropertyDefn prop )
	{
		if ( prop.isIntrinsic( ) )
		{
			
			return getIntrinsicProperty( prop.getName( ) );
		}
		
		if ( prop.getTypeCode( ) == PropertyType.ELEMENT_REF_TYPE )