Hi jurgen,
If you see the screenshots closely, you will get to know there are many plants for which authorization error is there(eg.1201,1204)
But for your understanding you can see PO no.4500000511 created under 1204 plant(display of ME23N).Even though in spool its showing you can set the deletion indicator for this item.
Now,if you check for PO no.4500016219 created under the same plant i.e 1204 showing message user has no authorization for plant 1204.
This is the issue.
And please find the screen shot for user for the particular step(job log)
Thanks and regards,
Akshay