Can some one explane me relation between sale.order.line and invoice.line.
For example i added field check_qty = fealds.float("Qty") to sale.order.line
when i confirm SO i get Invoice that is related to SO. In that invoice are invoice.lines that are created from SO sale.order.lines.
and i have field check = fields.boolean("check") in invoice.line.
so my goal is to check related sale.order.line of invoice.line if "check_qty" > 0 then i make field check = True