Proforma invoice dev feature should not be used. It will be removed because it was not correctly implemented. Even if name say the opposite, a proforma invoice is NOT an invoice but must be an order with a label "invoice" instead of "order".
Invoices is an accountancy term, but proforma invoice are not allowed to be counted as invoices by accountancy rules since it is just an order that must look like final invoice (and this is already the case with order templates)
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