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The storefront and the back office each hold part of the truth about an order. Most of the work is agreeing which part.
Catalogue and pricing maintained separately in two systems
Order state diverging between storefront and ERP
Stock figures that are accurate in neither system
Returns and partial fulfilment handled manually
One owner per attribute, with a contract for everything published downstream.
Order state modelled explicitly, including partial and cancelled paths.
Availability computed from a single source, with reservation rules.
Reverse logistics as a first-class flow rather than an exception.