What is a system of record?
The system of record for a fact is the one authorised to change it; everything else reads a copy. Designating one per domain — orders here, inventory there, product data somewhere else — is what makes disagreements resolvable, because there is a defined answer to which system is right.
Trouble starts when a domain has two. Inventory owned by both a storefront and a warehouse system produces conflicts that can only be settled by a person choosing, which makes it a standing process and not a design.
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