1. The country where a product is produced can change.
2. The brewer that produces a product can change.
3. A brewer can be acquired by another brewer.
4. A brewer can introduce a new product.
5. A product can have an incorrect country assignment.
6. A brewer may be acquired in some provinces but not others (???)
7. A product can be discontinued and return with a different UPC code (or UPC codes can change)
8. A new brewer may begin operations.
9. Two brewers can merge into a different name.
10. UPC “0” or “N/a”, must be picked up and identified.