Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
PropertyHandle propHandle = targetHandle
							.getPropertyHandle( propName );
					Iterator strcutIter = ( (List) value ).iterator( );
					while ( strcutIter.hasNext( ) )
					{
						Structure struct = (Structure) strcutIter.next( );
						propHandle.addItem( struct.copy( ) );
					}
				}
				else
				{
					IStructure struct = (IStructure) value;
					targetHandle.setProperty( propName, struct.copy( ) );
				}
				break;
			default :
				targetHandle.setProperty( propName, value );
		}
	}
	/**
	 * Checks this element with semantic rules.
	 * 
	 * @return the list of errors, each of which is the <code>ErrorDetail</code>
	 *         object.
	 * @see ErrorDetail
	 */
	public List semanticCheck( )
	{
		
		List exceptionList = getElement( ).validate( module );