Product Cost FIFO Module
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The Product Cost FIFO Module add a *FIFO* option in the Cost Method
field of the product form.

The cost price of product whose cost price method is *FIFO* will be
updated automatically when stock moves coming from a supplier or going
to a customer are made. The page `FIFO and LIFO accounting`_ on
Wikipedia gives some information about this costing method.

.. _FIFO and LIFO accounting: http://en.wikipedia.org/wiki/FIFO_and_LIFO_accounting