Am 10.03.2017 um 13:04 schrieb Cédric Krier:
> 
> I see that indeed for supplier lot, you even reuse the stock.lot. So for
> me, it breaks the contract that lot should represent the same unique set
> of products. Because you will have to entries in the stock.lot table for
> the same set.
> 
I do not think that these two entries are for the same set. In my
understanding the supplier lot is the set of goods that is under control
of the supplier, and the internal lot is the set of goods that is in my
control. So by the shipment the goods move out of one set and become a
new one that just origins from the supplier lot.

I see shipment similar like a step of processing. And it even can be, as
the goods are in an unknown environment while in transport.
For example i receive 75 kg of sugar of supplier lot A, perhaps they got
some temperature or moisture or something on the way. Something the last
shipment of 50 kg sugar of supplier lot A didn't. So these two batches
of sugar differ perhaps even enough to need different treatment. I would
say they are no longer in one set, as they can have different
properties. They just share their origin in supplier lot A. For me
shipmentIn is the logically perfect place to track this.

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