Market Segment - Can we link an internal location code to more than one segment code?

Summary:

I’m looking to understand best practice for using Market Segment. 

We are looking to create 6 segment codes where 5 segment codes will have unique location codes assigned to it and the 6th segment code will be inclusive of all location codes.

We would like to use the 6th segment code to load composites for job codes that does not require geo adjustments- this will allow us to have a cleaner output of data.

However, we are seeing two issues when testing:

1.      We are seeing the following warning when viewing the segment codes through Market Segment when implementing the above mentioned approach. We didn't see any documentation stating a location code can only be tied to 1 segment code.