Valuation rate calculation

How can I calculate valuation rate for each item in every sales invoice?
And how can I get buying amount?

Maybe this will help a bit: https://discuss.frappe.io/t/need-to-fetch-the-valuation-rate-for-an-item-in-the/58691

@smino Thanks for help, but it fetch valuation rate from item document
and it fetched with 0 value as it is in item document
How can i get the correct calculated valuation rate?

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