I've got a requirement to show a single file in a document library in 2 predefined groups. The View is first grouped by the column "Kunde" and sorted after "Dokumenttyp" As you can see in this screenshot, I got a document, which should be in both groups "BBraun" and "SealTest".
I've made "Kunde" a Choice - Checkbox Column and selected both values for the last document in the screenshot.
However, SP creates a new Group "BBraun, SealTest".
How do I come to this?