getContext().displayResult(resultUsingExtract);
// Produce the same result using a CustomModel directly.
CustomModel customModel = dp.createModel(sourceListSrc);
customModel.assign(unitPrice.getID(), unitPrice);
customModel.assign(unitCost.getID(), unitCost);
customModel.assign(calculation.getID(), calculation);
Source measValForSrc = customModel.createSolvedSource();
// Join Source objects that match the inputs of the solved Source produced by