KNX ETS The current subnet does not exist in your project. How to decide?

Question

Smart House

This warning pops up every time you run a partial download. Zadolbalo.
And knowledge is not enough.

Answer 1

It seems that when more than one ETS is running or someone else is connected to the KNX IP gateway (for example, the visualization program iRidium or OpenHab or MajorDomo), it becomes mandatory to assign an individual address. And, as I understand it, it is better that this address be within the existing range. For example, I have 1.1.*, 1.2.*, 1.3.*.
And if you appoint the one that is proposed (15.15.12 in this case), then he can still dump this page again every time.
And further! Sometimes the order of launching programs that access the KNX IP gateway is important.
First I launch OpenHab, then iRidium, then ETS.
If in a different order, then OpenHab may not work and the reasons will not be clear.