I got around this by putting an underscore in front of the abbreviation. So ID would be "_ID". You can do it for just ID but this will mess up the alphabetical sorting of your enumeration list. To get around that, you can add an underscore in front of every enumeration value.
Hope this helps!
Thanks Mike. That is the way to go.
Mike's answer below:-
For each attribute in your import mapping, you can choose to convert using a microflow. You can create a microflow that returns the proper enumeration value. For all states except Idaho, you can just lookup using the value you receive from the REST call, for Idaho, you can append the underscore to the beginning and get the enumeration value. The 'convert using' option can be found in the entity defintion of your import mapping.