Hello Micha,

I got same results - 3.8 mm closure of the loop which is ok.

https://ibb.co/0QDxZnB

My problem is that on the field we used some custom height for the reference point e.g. 0.00 while actual height differs.

When I insert reference points with actual height I am getting message "Error, the project contains uncombinable point typs, i.e. datum points as well as reference or stohastic points"

https://ibb.co/yWmMqhC

What is best practice of calculation actaul heights of the points?

Matija