Bug 183579 Model need hold on DimensionConditionHandle and DimensionJoinConditionHandle signleton or overwrites the equals and hashcode method
The Dataset Joint Editor need join two Editparts which have the same model. But the DimensionConditionHandle and the DimensionJoinConditionHandle are create a new instance erery time when I get them. So model need hold on them signleton or overwrites the equals and hashcode method.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/MemberRef.java
* Gets the local value of the referenced property, structure, or member.
	 * 
	 * @param module
	 *            the module
	 * 
	 * @param element
	 *            the element for which to retrieve the value
	 * @return the retrieved value, which may be null
	 */
	public Object getLocalValue( Module module, DesignElement element )
	{
		Structure struct = getStructure( module, element );
		if ( struct == null )
			return null;
		if ( propDefn.isList( ) )
		{
			
			
			
			
			
			
			switch ( refType )
			{
				case PROPERTY :
					return getList( module, element );
				case PROPERTY_LISTn :
				case PROPERTY_LISTn_MEMBER_LISTn :
					return struct;
				case PROPERTY_LISTn_MEMBER :