How to create in v10 an invoice line from code with only [product_id, invoice_id, quantity and price_unit]

Question

I want to create an account.invoice.line object from code, with only providing the product_id (which is loaded from sale.config.settings), the quantity (it will be always 1.0) and the price_unit, also the invocie_id (that was previously created).
In old api i used to call onchange methods pasing fields as parameters so i created the lines with the values returned with the onchange updating only certain values i wanted, but i cannot manage to do this with the new api.
Can i call the onchange pasi

Reinhart · Accepted Answer

I solved it by creating the line with 'account_id'=1, and a generic 'name', and then calling the _onchange_product_id() method on the created line, and then updated the price_unit with the correct amount.

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