Bug 164586 [compatibility]Preview attached report throws multiple exception[0901]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java
assert ( paramName != null && paramName instanceof String );
				String expression = ( String ) paramBindingCandidates
						.get( paramName );
				dteDataSet.addInputParamBinding( newInputParamBinding(
						( String ) paramName, expression ) );
			}
		}
		return elmtIter;
	}
	/**
	 * 
	 * @param modelDataSet
	 * @param dteDataSet
	 * @throws EngineException
	 */
	private void populateComputedColumn( DataSetHandle modelDataSet, BaseDataSetDesign dteDataSet ) throws EngineException
	{
		
		Iterator elmtIter = modelDataSet.computedColumnsIterator( );
		if ( elmtIter != null )
		{
			while ( elmtIter.hasNext( ) )
			{
				ComputedColumnHandle modelCmptdColumn = ( ComputedColumnHandle ) elmtIter
						.next( );
				IComputedColumn dteCmptdColumn = newComputedColumn( modelCmptdColumn );
				dteDataSet.addComputedColumn( dteCmptdColumn );
			}
		}
	}