An optional group of elements that provide an identifier, reference or persistent label for a particular price. For products that may be available at potentially many different prices, to different groups of purchasers or under different terms and conditions, this identifier may then be used in subsequent revenue reporting to specify which price the product was traded at.

Note that the price identifier will always be proprietary and must be unique across multiple pricing options for one product, but need not be unique across all products, nor need it be the same across all products offered at the same price point or under the same terms.

The composite is repeatable in order to provide multiple identifiers for the same price.