[Wonder-disc] Problem with ERXBatchingDisplayGroup

[Guido N. <gui...@ph...>]

Hi.

I have a problem with ERXBatchingDisplayGroup.

In my current project I have a page where I have to iterate through batches
of a large table and decided to use ERXBatchingDisplayGroup for this.

The page works fine when I use a programmatically created WODisplayGroup,
but when I set the type to ERXBatchingDisplayGroup this happens:

java.lang.IllegalStateException: sqlStringForKeyValueQualifier: attempt to
generate SQL for com.webobjects.eocontrol.EOKeyValueQualifier (kategorie =
(de.pharmaline.dga.DGAKategorie)'') failed because attribute identified by
key 'kategorie' was not reachable from from entity
'DGARedaktionellerBeitrag'


If I use a EOFetchSpecification without any qualifier I get an
indexOutOfBounds exception ...

Perhaps I'm doing something wrong with the display group - is there an
example out there how to use ERXBatchingDisplayGroup?

Thanks for help!
cug