Is it possible to lay KG pipe in gravel?

Hello everyone,
my neighbor said I should just lay the KG pipe for wastewater in gravel.
Is this feasible or does it have to be sand and does gravel damage the KG pipes? Is there a DIN regulation or something like that? Actually, the KG pipes are stable enough that they can be bedded in gravel, I think.
Many thanks and greetings from BaWü

Splitt is crushed aggregate. So sharp. I would not want to deviate from the usual sand.

I would do it, don't know of any case where Splitt has damaged a KG pipe

Why should it be advantageous to lay them in [Splitt]?

Maybe not advantageous, but [Splitt] is maybe currently left over at the construction site ^^

Exactly, it is freely available at the neighbor's.

have you done this several times already or how do you know that it works?
Because you said you don't know of any case where it caused a defect.