[Koha] item-level_itypes set but no itemtype set ...

[Heinrich Hartl]

I issue the command

# sudo koha-rebuild-zebra -f library

I get a couple of  error messages (to be precise 15) of the following type:

item-level_itypes set but no itemtype set for item (61258) at
/usr/share/koha/lib/Koha/Schema/Result/Item.pm line 698.

....

What can I do to correct the problem?

====== I am running currently koha 17.05 under Ubuntu 14.04

====== I am about to upgrade and want to correct the apparently
incorrect DB.

Heinrich