[ESMA 70-1861941480-56 MiFIR data reporting Q&A, Q&A 5.5]

For instruments without a defined expiry date for which the population of Field 24 (Expiry date) is mandatory according to the CFI validation rules [e.g. perpetual FX Rolling Spot Futures] Field 24 should be populated with the value 9999-12-31 (in accordance with the ISO format). In case the expiry date becomes determined during the life cycle of the financial instrument Field 24 should be updated accordingly.