Bug 133780 Execution sequence of valueExpr(DataItem) and onCreate() is not correct.
In the attached design. There is a DataItem in the table footer that I used to do a sum of the "Amount" column. In the test, I write the onCreate() method as: params["amount"]=Total.sum(row["AMOUNT"]); It passes the aggregation value to a parameter. In the "valueExpr" I write as: "AMOUNT:" + params["amount"] The expression is expected to export the sum. Actual output is: AMOUNT:null Followings are the definitions from Rom Text Spec & Rom Scripting Spec, valueExpr usually should be evalated after the onCreate() method. DataItem.valueExpr: The expression is usually evaluated when the report is rendered, not in the Factory, though it may be evaluated in the Factory also. onCreate: Executed when the element is created in the Factory. Called after the item is created, but before the item is saved to the report document file.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/DataItemExecutor.java
}
			if ( state == null )
			{
				state = new DataItemExecutionState( );
				dataItem.setExecutionState( state );
			}
			state.lastValue = value;
		}
		dataObj.setValue( value );
		
		processMappingValue( dataItem, dataObj );
		if ( context.isInFactory( ) )
		{
			DataItemScriptExecutor.handleOnCreate( (DataContent) dataObj,
					context );
		}
		if ( !duplicated )
		{
			startTOCEntry( dataObj );
			
			if ( emitter != null )
			{
				emitter.startData( dataObj );
			}
			finishTOCEntry( );
		}
		closeResultSet( );
		context.popContent( );
	}
}