Bug 194843 Cross tab Cube - Cannot delete a dimension using the cube builder
- Open the attached report design - Delete the "Region" group. Current behavior - Does now allow me to delete the group.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
* @param slotID
	 *            the slot from which to remove the content
	 * @param unresolveReference
	 *            status whether to un-resolve the references
	 * @param flag
	 *            Use the flag to indicate whether this method is do with the
	 *            element itself or do with its contents.
	 * @throws SemanticException
	 *             if this content cannot be removed from container.
	 */
	protected void checkBeforeRemove( DesignElement content )
			throws SemanticException
	{
		assert content != null;
		
		super.checkBeforeRemove( content );
		
		
		if ( !content.canDrop( module ) && !flag )
			throw ContentExceptionFactory
					.createContentException(
							focus,
							content,
							ContentException.DESIGN_EXCEPTION_STRUCTURE_CHANGE_FORBIDDEN );
		
		
		if ( hasDescendents( content ) )
		{
			throw ContentExceptionFactory.createContentException(
					new ContainerContext( content, focus.getSlotID( ) ),