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
{
					
					unfinishedRow.addUnresolvedCell( (ICellContent) cell
							.getContent( ), getLeftRowSpan(
									lastRow.finished, rowSpan ) );
				}
				else if(rowSpan==1)
				{
					if(!lastRow.finished)
					{
						unfinishedRow.addUnresolvedCell( (ICellContent) cell
								.getContent( ), 1 );
					}
				}
			}
				
		}
	}
	
	public void resolveAll()
	{
		/*
		 * 1. scan current row and calculate row height
		 * 2. update the height of drop cells
		 * 3. update the height of row
		 */
		
		if(rows.size( )==0 || !hasDropCell)
		{
			return;