How to automatic wirte in .beanount file specific price information？

Hi,everyone! I get a problem that is when inserted those directive in .beanount file: 2018-5-14 commodity USD price:"CNY:yahoo/CNY=X" name:"US Dollar" and the prices directive not automatic add into this file,What's wrong?What can I to do? tell me thank your. -- You received

How to automatic wirte in .beanount file specific price information？

Hi,everyone! I get a problem that is when inserted those directive in .beanount file: 2018-5-14 commodity USD price:"CNY:yahoo/CNY=X" name:"US Dollar" and the prices information not automatic add into this file,like: