Hello Manfred,

Are you building a full-fledged report, or using the 'Quick Report' option in Update mode? In either case you can limit what appears in the resulting report by entering search criteria in search mode prior to running your report.

To retrieve only records where that element is empty, you can enter an "=" (without quotes) in the element while in Search mode. Now when you run your report (or Quick Report) you should receive the records you are after.

If you are building a full report, you can even save this search criteria into the report so it always pulls the records where the element is blank. Here's a brief Knowledgebase article that covers attaching a retrieve spec to a report http://lantica.com/support/kb/article/000111