I would expect a sum after the word "netto".

This could refer to a standard term of payment, where "net" means XXX days from the date of invoice, such as "30 days net".


If it were to refer to the fact that the customer pays "net" ("net price") as opposed to "gross", the same would still apply, ie the translation would not change.

In any case, without any further context or explanation, I would translate the sentence the same way in both cases.