How do I manually change the zip code entered through locations on the order form?

Question

1C-Bitrix

Good afternoon!

The site has an order form sale.order. It has an index field, where the index from Locations is pulled up. Based on it, the delivery is calculated and everything goes well until the person wants to clarify the index and enters a new value. After the order is generated, the value from the Locations comes to the admin panel, and not what the person entered. How can this be fixed so that the index entered by the person is pulled into the order itself.
And where does the formation of an order and the collection of data from the fields in this component take place?

Thank you in advance.