Bug 178519 Problems in multi-rows header
Please see the attachments.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/cache/TableAreaLayout.java
{
								verticalAlign( ref );
							}
							dropCells.add( ref );
						}
					}
					else
					{
						cell.setHeight( height );
						verticalAlign( cell );							
					}
				}
					
			}
			
		}
		
		
	}
	
	protected void keepUnresolvedCell(Row lastRow)
	{
		unfinishedRow = new UnresolvedRow();
		for(int i=0; i<columnNumber; i++)
		{
			CellArea cell = lastRow.getCell( start + i );
			if(cell!=null)
			{
				int rowSpan = cell.getRowSpan( );
				if(rowSpan< 0 || rowSpan>1)