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Explanation: Los = En "lot", a particular number of pieces (a portion of goods)produced and shipped to a customer. Often one lot = one shipment, but a shipment may also contain of many lots.
Part coming from different Anlieferungloses (lots beeing delivered)are then used for the production of the final products.
It means, the certificate must clearly say, which lot numebers of the parts have been used for the production of the final product.
I hope it will be usefull for you.