Работа с ценами в форме редактирования элемента инфоблока

function BXIBlockAfterSave(&$arFields) {

   static $use_handler = true;


   if ($use_handler) {

     $use_handler = false;
     $PRODUCT_ID = $arFields['ID'];
     CPrice::DeleteByProduct($PRODUCT_ID);
     $arField = Array(
      "PRODUCT_ID" => $PRODUCT_ID,
      "CATALOG_GROUP_ID" => 1,
      "PRICE" => 1,              // сюда цену. у всех товаров цена 1 руб.
      "CURRENCY" => "RUB"
     );

    if(CCatalogProduct::Add(array('ID'=>$PRODUCT_ID))){
     CPrice::SetBasePrice($arFields['ID'], 1, 'RUB');

    $res = CPrice::GetList(array(),array("PRODUCT_ID" => $PRODUCT_ID, "CATALOG_GROUP_ID" => 1));
               if ($arr = $res->Fetch())
               {
                  
               CPrice::Update($arr["ID"], $arField);
               }
               else
               {
               CPrice::Add($arField);
               }

     $use_handler = true;

     //CPrice::Update($arFields['ID'], $arField);      
    }
}
}

<?
use Bitrix\Highloadblock\HighloadBlockTable;
use Bitrix\Main\Loader;
use \Bitrix\Iblock\PropertyIndex;
Loader::includeModule('highloadblock');
Loader::includeModule('iblock');
AddEventHandler("iblock", "OnStartIBlockElementAdd ", "OnAfterIBlockElementAddHandler");
AddEventHandler("iblock", "OnStartIBlockElementUpdate", "OnAfterIBlockElementAddHandler");
//AddEventHandler('catalog', 'OnSuccessCatalogImport1C', array('MyClass','customCatalogImportStep'));
//AddEventHandler("iblock", "OnBeforeIBlockAdd", "AddElementOrSectionCode");
//AddEventHandler("iblock", "OnBeforeIBlockUpdate", "AddElementOrSectionCode");
AddEventHandler("iblock", "OnBeforeIBlockElementAdd", "AddElementOrSectionCode");
AddEventHandler("iblock", "OnBeforeIBlockElementAdd", "OnAfterIBlockElementAddHandler");
AddEventHandler("iblock", "OnBeforeIBlockElementUpdate", "AddElementOrSectionCode");
AddEventHandler("iblock", "OnBeforeIBlockElementUpdate", "OnAfterIBlockElementAddHandler");
AddEventHandler("iblock", "OnBeforeIBlockSectionAdd", "AddElementOrSectionCode");
AddEventHandler("iblock", "OnBeforeIBlockSectionUpdate", "AddElementOrSectionCode");
AddEventHandler("sale", "OnOrderNewSendEmail", "bxModifySaleMails");
AddEventHandler("sale", "OnOrderAdd", "OnOrderAdd_mail");
AddEventHandler("catalog", "OnStoreProductUpdate", array("MyClass", "OnStoreProductUpdateHandler"));   //изменение товара на складе
AddEventHandler("catalog", "OnStoreProductAdd", array("MyClass", "OnStoreProductUpdateHandler"));   //добавление товара на склад
AddEventHandler("catalog", "OnProductUpdate", "notInStore"); //событие, для того, что бы вытащить данные по товару
class MyClass {
            protected static $handlerDisallow = false; 
            public static function OnStoreProductUpdateHandler($ID, $arFields)
               {
                  CModule::IncludeModule("iblock"); 
                  CModule::IncludeModule("sale"); 
                  CModule::IncludeModule("catalog");   
                     if (self::$handlerDisallow) 
                     return; 
                     self::$handlerDisallow = true;
                        function notInStore($ID,$Fields){
                           $ar_res = CCatalogProduct::GetByIDEx($ID); //получаем данные товара по ID
                           $PRODUCT_ID = $ar_res['ID']; // $ID = прихода товара на склад
            $price_2 = 1;                 //у всех товаров цена 1 руб.
                           $PRICE_TYPE_ID = 1;                   // оставляем для первого типа товаров.
                           $arFields = Array(
                              "PRODUCT_ID" => $PRODUCT_ID,     
                              "CATALOG_GROUP_ID" => $PRICE_TYPE_ID,
                              "PRICE" => $price_2,                          // сюда цену.
                              "CURRENCY" => "RUB",
                              "QUANTITY_FROM" => false,
                              "QUANTITY_TO" => false
                              );
                           $res = CPrice::GetList(
                              array(),
                              array(
                                 "PRODUCT_ID" => $PRODUCT_ID,
                                 "CATALOG_GROUP_ID" => $PRICE_TYPE_ID
                              )
                           );
                           if ($arr = $res->Fetch())
                              {
                                 
                              CPrice::Update($arr["ID"], $arFields);
                              }
                           else
                              {
                              CPrice::Add($arFields);
                              }

                           }
               }
         }
function OnOrderAdd_mail($ID, $val)
{
    addmessage2log($val);
}
function bxModifySaleMails($orderID, &$eventName, &$arFields)
{
    if (empty($arFields['ORDER_LISTR'])) {
        return false;
    }
}
function AddElementOrSectionCode(&$arFields) {
    $params = array(
        "max_len" => "100",
        "change_case" => "L",
        "replace_space" => "_",
        "replace_other" => "_",
        "delete_repeat_replace" => "true",
        "use_google" => "false",
    );

    if (strlen($arFields["NAME"])>0 && strlen($arFields["CODE"])<=0) {
        $arFields['CODE'] = CUtil::translit($arFields["NAME"].rand(), "ru", $params);
    }
}

function OnAfterIBlockElementAddHandler(&$arFields)
{
   static $use_handler = true;


 if ($use_handler) {

        $use_handler = false;
        $PRODUCT_ID = $arFields['ID'];
        CPrice::DeleteByProduct($PRODUCT_ID);
        $arField = Array(
            "PRODUCT_ID" => $PRODUCT_ID,
            "CATALOG_GROUP_ID" => 1,
            "PRICE" => 1,                          // сюда цену закупочную.
            "CURRENCY" => "RUB"
        );

   if(CCatalogProduct::Add(array('ID'=>$PRODUCT_ID))){
        CPrice::SetBasePrice($PRODUCT_ID, 1, 'RUB');

    $res = CPrice::GetList(array(),array("PRODUCT_ID" => $PRODUCT_ID, "CATALOG_GROUP_ID" => 1));
                           if ($arr = $res->Fetch())
                              {
                                 
                              CPrice::Update($arr["ID"], $arField);
                              }
                           else
                              {
                              CPrice::Add($arField);
                              }

        $use_handler = true;

        //CPrice::Update($arFields['ID'], $arField);            
   }
}
}

// регистрируем обработчик
AddEventHandler("search", "BeforeIndex", "BeforeIndexHandler");
// создаем обработчик события "BeforeIndex"
function BeforeIndexHandler($arFields)
{
    if(!CModule::IncludeModule("iblock")) // подключаем модуль
        return $arFields;
    if($arFields["MODULE_ID"] == "iblock")
    {
        $db_props = CIBlockElement::GetProperty(                        // Запросим свойства индексируемого элемента
            $arFields["PARAM2"],         // BLOCK_ID индексируемого свойства
            $arFields["ITEM_ID"],          // ID индексируемого свойства
            array("sort" => "asc"),       // Сортировка (можно упустить)
            Array("CODE"=>"CML2_ARTICLE")); // CODE свойства (в данном случае артикул)
        if($ar_props = $db_props->Fetch())
            $arFields["TITLE"] .= " ".$ar_props["VALUE"];   // Добавим свойство в конец заголовка индексируемого элемента
    }
    return $arFields; // вернём изменения
}

AddEventHandler("iblock", "OnBeforeIBlockElementUpdate","SaveMySection");
function SaveMySection(&$arFields)
{
    if (@$_REQUEST['mode']=='import')//импорт  из 1с?
    {
        $ss = 0;
        $db_old_groups = CIBlockElement::GetElementGroups($arFields['ID'], true);
        while($ar_group = $db_old_groups->Fetch())
        {

            if(!in_array($ar_group['ID'],$arFields['IBLOCK_SECTION'])) {
                $arFields['IBLOCK_SECTION'][$ss] = $ar_group['ID'];
                $ss++;
            }
        }

        sort($arFields ['IBLOCK_SECTION'], SORT_NUMERIC);
        $arFields ['IBLOCK_SECTION'] = array_pop($arFields['IBLOCK_SECTION']);
        //$el = new CIBlockElement;
        //$res1 = $el->Update($arFields['ID'], $arLoadProductArray);
       // CIBlockElement::SetElementSection($arFields['ID'], $arFields['IBLOCK_SECTION']);
       // $_AE[$arFields['ID']] = $arLoadProductArray;
        //unset($arLoadProductArray);
        //PropertyIndex\Manager::updateElementIndex($IBLOCK_ID, $arFields['ID']);
    }
}
?>

AddEventHandler("catalog", "OnPriceAdd", "OnAfterIBlockElementAddHandler";);
AddEventHandler("catalog", "OnPriceUpdate", "OnAfterIBlockElementAddHandler";);

AddEventHandler("catalog", "OnBeforeProductPriceDelete", array("MyClass", "OnBeforeProductPriceDeleteHandler"));

class MyClass
{
  protected static $dontDelete = 0;

  function OnBeforeProductPriceDeleteHandler($id, &$arr = null) {
    if(!in_array(self::$dontDelete, $arr)) {
      $arr[] = self::$dontDelete;
    }
    return true;
  }
...

//где-то в обработчике OnPriceUpdate/OnPriceAdd создаем новую цену для товара
self::$dontDelete = CPrice::Add($arNewPrice);
...