$priceSetID = $form->_params['priceSetId'] = $paramsProcessedForForm['price_set_id'];
$priceFields = CRM_Price_BAO_PriceSet::getSetDetail($priceSetID);
$priceSetFields = reset($priceFields);
$form->_values['fee'] = $priceSetFields['fields'];
$form->_priceSetId = $priceSetID;
$form->setFormAmountFields($priceSetID);
$priceSetID = $form->_params['priceSetId'] = $paramsProcessedForForm['price_set_id'];
$priceFields = CRM_Price_BAO_PriceSet::getSetDetail($priceSetID);
$priceSetFields = reset($priceFields);
$form->_values['fee'] = $priceSetFields['fields'];
$form->_priceSetId = $priceSetID;
$form->setFormAmountFields($priceSetID);