Web Order product matching sequence.

Products are matched by the following sequence: web store specific Alt Product ID, Acctivate Product ID, general Alt Product ID, UPC, and Customer Product ID

  1. Alternate Product ID specifically related to that web store template
  2. Acctivate Product ID
  3. Alternate Product IDs unrelated to that web store template
  4. UPC
  5. Customer Product ID for the Customer on that order.

For more information, review this article.