We have some custom entries in the file 'custom.ini' that are stored in
the Sybase database.
When I start a query for these custom attributes then I get the
following error message:

"Unable to process the query. Ensure that the database connection is up.
For more information, see the error message documentation at

The database connection is up and running because when I start a query
of a standard attributes of ZfD then I get a result.
I get this error message just on custom entries.

I have enable the debug logs, how explaned on the documentation, but
without positive results.

Any ideas?