Definition
See
Currencies.
Use
In Country Version China, two currency codes – CNY (Yuan) and RMB (Renminbi) - are maintained in the currency table. CNY is the ISO code and is used in the area of international business. RMB is China’s official code and is used in the area of domestic business. In your Customizing settings, you can choose to use either CNY or RMB.

We advise you to use currency code CNY if you are conducting your business at an international level.