In the Solution Design Reference document, variable 'Product Category" is assigned to "eVar4" and is set on a product page with value "Shoes". It is then not recorded in the shopping cart page, the "Order summary" page, or the "Order completion" pages.
The variable is configured like this:

If we count the number of orders per product category in a report, which value receives one order after one visitor completes a purchase from that Product page?
Since eVar4 is set to expire after purchase event, the value ''Shoes'' will be persisted throughout the visit until the order is completed. Therefore, the report will show one order for product category ''Shoes''.
References: https://experienceleague.adobe.com/docs/analytics/components/variables/conversion-variables/conversion-var-overview.html?lang=en#expiration
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