Bug 205938 Cross Tab: 2.2.9 Measures from a cube can be dragged and dropped to left and not to right.
If user wants to show an existing measure on a cross tab that he has defined in a cube, he can only add it to the left and not to the right of an existing measure. Proposed solution User should be ale to add a measure both to the left and right of an existing measure.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editpolicies/ReportFlowLayoutEditPolicy.java
x = prevRight + ( r.x - prevRight ) / 2;
				}
				else if ( prevRight == r.x )
				{
					x = prevRight + 1;
				}
			}
			if ( x == Integer.MIN_VALUE )
			{
				
				Rectangle parentBox = transposer.t( getAbsoluteBounds( (GraphicalEditPart) getHost( ) ) );
				x = r.x - 5;
				if ( x < parentBox.x )
					x = parentBox.x + ( r.x - parentBox.x ) / 2;
			}
		}
		else
		{
			/*
			 * We only have before==false if we are at the end of a line, so go
			 * halfway between the right edge and the right edge of the parent,
			 * but no more than 5 pixels.
			 */
			Rectangle parentBox = transposer.t( getAbsoluteClientBounds( (GraphicalEditPart) getHost( ) ) );
			int rRight = r.x + r.width;
			int pRight = parentBox.x + parentBox.width;
			x = rRight + 5;
			int index = epIndex >= 0 ? epIndex : getHost( ).getChildren( )
					.size( ) - 1;