On 9 April 2018, the Committee on Payments and Market Infrastructures (CPMI) and the International Organization of Securities Commissions (IOSCO) co-published a report that provides technical guidance to authorities on harmonised definitions, formats and usage of a set of critical data elements for over-the-counter (OTC) derivative transactions reported to trade repositories, excluding the unique transaction identifier (UTI) and the unique product identifier (UPI). The guidance is global in scale, takes account of relevant international technical standards where available and is jurisdiction-agnostic, thus enabling the consistent global aggregation of OTC derivatives transaction data.  The guidance is not, however, a set of rules to be followed directly by market participants.