Incorrect purchase price of goods

There is such a problem, when copying a process using the standard Copy button, incoming prices are also copied, and at this moment the prices may already be different, that is, they need to be updated. We can’t update the prices with the standard action, since the prices of the cards are in the currency, and they are also displayed in the process in the currency, so I reset the price with the action Write the value in the process product field http://joxi.ru/E2pZ6egH46MzLr, while Box immediately reassigns Purchase price, but pulls the first supplier from the product card. An example process is https://crm.ohrana.ua/admin/customorder/zakaz-klienta/1527047/edit/, for this product the second supplier from the list of suppliers is currently relevant, but the purchase price has been raised by the first. At the same time, even if I set the action Set the supplier with the lowest price and the availability of http://joxi.ru/MAj5gzlu1gKnD2, then the price still remains incorrect, and is pulle