Finger print nationality code question

I just did my finger print last Friday. I just noticed that when the officer register my finger print case, he put my country code as "RC". Is that mean "Republic of China"? I am from mainland China off course, and I thought there is only one China anyway so I did not pay attention to it.

Can anybody tell me what is the country code suppose to be? Should it be either "CN" or "PRC"? Does this "RC" code can cause any effect to my I-485 case? If so, how can I correct it?

Many thanks.