This module is currently used as a base for shipment reporting per picking type (aka zone).
e.g. :
A shipment report that contains several products coming from differents picking zones (parts of stock).
STOCK
FOOD DRUGS HARDWARE
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\/ \/ \/
Picking Type Food Picking Type Drugs Picking Type HARDWARE
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\/ \/ \/
Pack
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\/
Ship => X products from Food
Y products from Drugs
Z products from Hardware