The twin should connect a complete assembly with subsystems, components, accessories, peripherals, consumables, replacement parts and upgrades. A relationship describes how records connect. It does not make those records interchangeable.
What belongs to each identified product| Record or decision | What it needs to say |
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| Product and revision | Stable identity, manufacturer, exact version/variant, specification and configuration. |
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| Relationships | Parent assembly, bill of materials, dependencies, compatible options and replacement or successor references. |
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| Evidence | Source, scope, date, author/responsible party and status of each technical or compatibility claim. |
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| Commercial offers | Verified maker and contractual seller, exact offer versions, quantity or usage unit, validity, costs, availability and delivery terms. |
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| Service and history | Applicable service agreements, care, maintenance, accepted corrections, upgrades and lifecycle records. |
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One twin can link to several eligible maker offers, with distinct stock and terms. Retailer resale offers are outside the listing direction. The order book compares the offers for a defined specification, use context and time horizon. A price on a similar-looking component is not a substitute for fit evidence.