There is no relation between the regulatory country, which controls valid channels and powers for the WLAN radios, and any information in certificates that you upload.
The country setting in the AP should always be the country that the AP is located in. Ignoring that may place you in a legal risk as you are violating local radio regulations.
For what purpose did you upload a CA cert to your Instant AP (RAP)?
As Colin suggest can you share the error message that you see (and if possible the certificate itself as well) during import?