A Proprietary Index workflow was created in order to facilitate the creation of OTC ISINs with proprietary indices as underlying. The relevant documentation can be found here.
‘Underlying Instrument Index Prop’ is the specific attribute field used for the Proprietary Index that has been submitted by users as defined in the workflow document.
On submission of an OTC ISIN request, users are instructed to input their unique company prefix followed by a “-“ followed by the index name eg ‘12345-ABCDEF’
Anonymised index names will be published by the DSB containing a unique company prefix prior to each index name submitted.