[Koha] Z39.50 server finds the records but delivers no fields

[Beda Szukics]

Hi all

I'm trying to use my koha instance as a Z39.50 server. I uncommented the
statements in /etc/koha/sites/_mysite_/koha-conf.xml.

The sever is up. I can search the records. They are displayed but
without any field-data. Only the LDR is displayed.

Where is my mistake?

Beda