Spend by category: Before classification

Hello Experts,

We are implementing Spend Classification and have noticed that the Spend Category: Before Classification does not populate when the classification is done for AP invoices.

We were assuming that it would be populated at least for the PO Matched invoices, are we missing any step in doing the classification?

I have created a Taxonomy, Created a Training set and KB, and Classified Invoices for a date range.

Below is a screenshot from Invoice Classification:

Any insight is appreciated.

Thank you,

Maleena