Bill Credit lines (items / expenses) - Unable to add Location

When I create a bill credit from a bill, the location on the lines becomes the location applied to the same lines on the bill credit. I can see this because of the GL impact and by using saved search.

When I try to add Location to the sublist fields on bill credit, it is there to check but then does not show up on screen.

We have need to occasionally process bill credits without an original bill, where we need to attribute them to different locations (reporting). Before I travel the route of scripting, I wanted to see if a guru could tell me I'm missing something or confirm my assessment :)