Have you checked whether these have taxon determinations? When testing v6.14, I got the List index out of bounds error when trying to view taxon occurrences without determinations from the filter result in the report wizard. They arose from data entry that caused an unhandled error. The survey event, sample and taxon occurrence were created but not the determination.

Without a det. there is no taxon name to be displayed. The problem is that without a det. there is nothing to select to view or delete it. Also, you can’t delete the sample because it contains a TOcc. I think that if a TOcc has no Tdet or if its TDet contains a taxon list item key that isn’t in the dictionary then this should appear in the observation hierarchy with ‘Taxon name not available’ in place of the name. I suggested this to JNCC as part of the v6.14 testing. This would allow users to view and/or delete these items.