Hi Paolo,
I haven't updated the wiki pages, but for now.
You can download a database I have set up for you at
http://www.paintedfrogceramics.com/OpenOffice/SRB/Paolo.odb
In the database you will find a single report.
The report uses functions to create the sub totals, a grand total, for
records with NULL in the cost field the string NULL is printed in red on
the report. I believe it covers all the example cases that you have
asked about.
If you have questions feel free to ask. Meanwhile I'll update the page
at wiki with a small explanation of the steps in creating the report.
Drew
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