Bug 198604 After refresh the library, the link groups key are changed in cube builder[1101]
Description: After refresh the library, the link groups key are changed in cube builder[1101] Build number: 2.2.1.v20070802-0630 Steps to reproduce: 1, New a cube in library, the cube has a joint key between dimension table and facttable 2, Using the cube in a report design 3, Check the joint status in link group 4, Refresh the library in outline 5, Recheck the joint staus in link group Expected result: After step5, the joint status are correct and as same as the status in library Actual result: The dimension table is missing and the joint key is disconnected
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ElementStructureUtil.java
* The two element should be the same type.
	 * 
	 * @param childModule
	 *            the module where the child element resides
	 * 
	 * @param child
	 *            the child element
	 * @param parent
	 *            the extends parent element
	 * @return <code>true</code> if the refresh action is successful.
	 *         <code>false</code> othersize.
	 * 
	 */
	public static boolean updateStructureFromParent( Module childModule,
			DesignElement child, DesignElement parent )
	{
		if ( child == null || parent == null )
			return false;
		if ( child.getExtendsElement( ) != parent )
			return false;
		Map overriddenValues = collectPropertyValues( childModule, child );
		boolean retValue = duplicateStructure( parent, child, childModule );
		distributeValues( childModule, child, overriddenValues );
		return retValue;
	}
	/**
	 * Scatters overridden values to virtual elements in the given design
	 * element.
	 * 
	 * @param module