Delete property set for which time series data was already created

Hi,

in our IoT AE tenant I set up a simple example with a property set, a thing type and a thing for which I sent some test data. Now I want to "teardown" this example again.

First I successfully deleted the thing and then the thing type. But when I try to delete the property set, it says "Incompatible change: Time-series data exists for property set type XYZ". Is that a bug or a feature?

If it's a feature, is there a way to get rid of the property set again?

Thanks and best regards
Felix