Physical location field in Document information: Tweak for XProc display

[LucasHorseshoeBend]

In document information / physical location can the letter number be deleted? i.e., 43.03.10 in attached screen shot
It is a relict of the history of the project, and can cause confusion because it looks as if it is part of an archival catalogue system identifier.
I can't see where else it is required, although it is for the editors' view as it is the identifier used in searching by file. Is there a necessary function hidden away some where that requires it to be visible in XProc?
It can be used as a search term in XProc Text search box, but one would have to be very familiar with the structure of the source documents to do that.
Not urgent, next time the interface is refreshed will do.