The pivot table can't count blank cells, so if you put a Product field
in the row area, and Count of Product in the data area, the (blank) item
will show nothing in the data area.

However, if you add a different field to the data area, you may see the
correct count. For example, if the Invoice Date field always has a
value, add that to the data area, and summarize by Count. The pivot
table will then show the count of records with a blank product field.

scrufty wrote:

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Debra Dalgleish
Contextures
http://www.contextures.com/tiptech.html