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/elements/OdaDataSource.java
if ( EXTENSION_ID_PROP.equals( propName ) )
			return extensionID;
		return super.getIntrinsicProperty( propName );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.DesignElement#setIntrinsicProperty(java.lang.String,
	 *      java.lang.Object)
	 */
	protected void setIntrinsicProperty( String propName, Object value )
	{
		if ( EXTENSION_ID_PROP.equals( propName ) )
		{
			extensionID = (String) value;
			if ( extensionID != null )
				provider = ODAProviderFactory.getInstance( ).createODAProvider(
						this, extensionID );
			else
				provider = null;
		}
		else
		{
			super.setIntrinsicProperty( propName, value );
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.DesignElement#checkExtends(org.eclipse.birt.report.model.core.DesignElement)