We created a project for the mpc5748g in S32 DS and followed the instructions in this thread.
This worked fine for a single core as described in the guide.
Then we created a similar project, this time for the three cores of the processor. This resulted in one project per core.

The problem is that we can only define the debugger for the ..._Z4_0 project. For the _Z2 and Z4_1 projects the necessary combo box is disabled

Our first thought was that the debugger setting is inherited from the Z4_0 project. But while we can debug core Z4_0 using OpenSDA, this does not work for Z2. A debugging attempt ends with

What has to be done to be able to debug on all cores using OpenSDA?