Sale Supply Module
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The Sale Supply module adds a "supply on sale option" to purchasable products.
If checked, it will generate a purchase request for each sale line of this
product regardless of the stock levels. Once the purchased products are
received they are assigned on the customer shipments.
If the purchase is cancelled the sale goes back to the default supply method.

.. warning::
    If the shiment method is *On Invoice Paid*, the purchase request will be
    created only when all the invoice lines are paid
..