What does "Copy purchasing category to product fiscal classification for Payables invoice lines" do?

Summary:

What does "Copy purchasing category to product fiscal classification for Payables invoice lines" do?

Content (please ensure you mask any confidential information):

There is checkbox "Copy purchasing category to product fiscal classification for Payables invoice lines" available on the Country Default Controls page. I have checked it in a non-production environment (for Belgium). I have created a (Belgian) Payables invoice with 2 lines: one unmatched where I manually entered a value for the product fiscal classification and one matched line where the application copied the Purchasing Category value from the related PO line. The purchasing category is not copied to the product fiscal classification for the matched line. In AP_INVOICE_LINES_ALL column PRODUCT_FISC_CLASSIFICATION remains empty for all invoice lines.