Excuse me for disagreeing. The official source for iata codes is the IATA: https://www.iata.org/en/publications/directories/code-search/?airport.search=GHV

Likewise, the official source for the ICAO code is the Romanian AIP, it does mention Brasov/San Petru airfield but not this one. https://www.aisro.ro/aip/2023-05-18/html/ro/aip_frames.html

Neither is it very important: as long as the aerodrome is not in use, its codes are not really relavant.