Thank you all for your answers, this feed my reflexion a lot.
I haven’t fully cracked it yet.
They do not exist, unfortunately. We do not capture anything that could play that role (for instance company registration numbers, which could, in theory, be a good idea).
Those businesses are represented by their name+ their adress.
All free text entered in our apps, so data quality is very bad.
So no actual business key available.
Would this meen that DV does not work here ?