The answer is the same. You can do whatever you like.
The default is that tool and base are not selected using value -1 which on HMI may be shown as "?" for 'unknown'. There are seasons for that and for example one may be the workspace monitoring after program is deselected.
And if you want to use some tool and base, you need to select it either by program or manually (for jogging for example when no program is selected). the fact is that robot can have many programs and each program can be using different tool and base
KUKA has no idea which tool or base you want to use as a default. Neither KUKA nor we know that the error message you see on your teach pendant. If you would like some comments on that, you may want to tell or show what the message is really about.
If you want that YOUR default tool and base are always in every program you make on your robot, feel free to modify program template (Vorlage).
Thanks Panic Mode
As always, you save the day.
I owe you a beer