Why are units appear as all zeroes in Product reports?

Why are units appear as all zeroes in Product reports?

For products:
Webtrends On Demand
Webtrends Analytics 9.2x
Webtrends Analytics 8.x

Last modified: 1/1/2011

Situation:
Although the site is tagged with the minimum commerce tags (WT.pn_sku, WT.tx_u, and WT.tx_s) units are reported as zero in all product reports. 

Solution:
Add the parameter WT.tx_e=p to the parameters on the purchase page. 
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