ZRH2 is the rate used in Working Capital & credit management queries.

• M is a daily rate available for all target currencies (EUR, USD, CNY...) 
• ZRHO is a month-end rate available for all target currencies (EUR, USD, CNY...).
• ZRH2 is equal to ZRHO but only for EUR as target currency; NB: it exists only in BW, not in SAP