If you know a little about how MARC works, you can fairly easily reconfigure Athenaeum to process MARC files differently.

For example, SCIS recently switched tagging publisher information with the 264 (RDA) tag (they were using the previous standard 260 tag).

If you are missing the 264 tag, this video will show you how to make the change:

https://youtu.be/OXVuR4l94ns

The example uses Athenaeum Pro 2017 however it works in earlier versions of Athenaeum as well.