The Production detail block comprises the single data Group P.28. The block as a whole is non-repeating. It is optional within the <Product> record, and is used only when there is a requirement to communicate specification and file manifest detail relating to intermediary services within the supply chain, for example manufacturing on demand, e‑book conversion services or distribution of digital audio. It is not expected to be present in most ONIX messages – though recipients not requiring the data should be able to ignore the entire block if it is supplied.

When used, the block should normally contain at least one instance of <ProductionManifest>. It may be empty only within a partial or ‘block update’ (Notification or update type 04, see P.1.2), when the intention is to remove all previously-supplied manifest detail.