Bug 183918 get relative file path of linkage library
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ComplexPropertyCommand.java
checkAllowedOperation( );
		assert propDefn != null;
		assertExtendedElement( module, element, propDefn );
		PropertyDefn memberDefn = ref.getMemberDefn( );
		List list = null;
		if ( memberDefn != null
				&& memberDefn.getTypeCode( ) == IPropertyType.LIST_TYPE )
		{
			
			list = (List) ref.getValue( module, element );
		}
		else
		{
			checkListMemberRef( ref );
			list = ref.getList( module, element );
		}
		if ( list == null )
			throw new PropertyValueException( element, ref.getPropDefn( ),
					null,
					PropertyValueException.DESIGN_EXCEPTION_ITEM_NOT_FOUND );
		if ( posn < 0 || posn >= list.size( ) )
			throw new IndexOutOfBoundsException(
					"Posn: " + posn + ", List Size: " + list.size( ) ); 
		if ( memberDefn != null
				&& memberDefn.getTypeCode( ) == IPropertyType.LIST_TYPE )
			doRemoveItem( ref, propDefn, posn );
		else
			doRemoveItem( new CachedMemberRef( ref, posn ) );
	}
	/**