Thank you, that was quite quick.
Well, you can set values there, how else could you update appointments - but I understand that there is probably no way to find out which calendar app made the entry in order to know whether they have to be corrected - or is there?
As stated before, it if was an empty field (like null) or if a distinct value like 0 was used and
1=tentative (thank you for the correct term)
this could be recognized and there could be an (advanced) option in DAVx5 about how to handle that.
On the other hand if it is set to 0 and
0=tentative (thank you for the correct term)
DAVx5 may not be able to distinguish an App that uses the 0 value correctly and apps like Business Calendar 2 and Samsung Calendar that have this issue.
And yes, I understand and agree that this should be fixed by the calendar app, but as this seems to be an quite widespread issue it would be nice to add a fix if it is similar easy as thought of in my post. I doubt that Samsung will fix it, as it has been around at least 1.5 years.