Auto basic rate in stock entry

hello comunity . I would like to know why I can’t manually change rate in stock entry . and from where exactly these values are coming from

Transfer = inventory already exists in the source warehouse with some valuation, so modifying the rate doesn’t make much sense.

The rate is computed as per active valuation method on that item.

https://docs.erpnext.com/docs/v13/user/manual/en/stock/articles/calculation-of-valuation-rate-in-fifo-and-moving-average