Use controlled states
Available, held, under inspection, sold and withdrawn each have a clear operational meaning.
A unique object cannot be available twice
Participants and Vintage Design Center share responsibility for keeping designation, location and availability current.

Available, held, under inspection, sold and withdrawn each have a clear operational meaning.

Only a confirmed object and expiry time reserve stock. Expired holds return to the correct state.

If a participant sells a connected object independently, it must be removed from Vintage Design Center availability at once.

Transferring an object between online, market and Center routes changes the active agreement only when the move is recorded.
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