While my product is my consulting and software I invoice to Canada as. My bet is this is then hoping you will reveal such but I wouldn't. It is required to show country of origin but no law mandates you reveal your cost. If you follow what VAT does they pay on what they paid you and not what you paid for the product.
If this needs more explanation I will defer you to a lawyer but as I trade there (albeit not a hard good) and lived there for many years, I can offer this to you.
Be sure to cultivate this relationship. Call and talk but your costs are yours to keep.
I have a small business (located in the U.S.) where I sell small tools that I have manufactured in China. A large retailer located in Canada is interested in my products, and they've asked me to submit my wholesale prices and a few samples for them to review. In their letter, they also said:
Please ensure that you include a commercial invoice that shows both the wholesale value of the product, and its country of origin. We need this for customs clearance purposes.
At first I assumed they were simply talking about a commercial invoice from my business -- showing the wholesale price I quoted them and United States as the country of origin (since that's where my business is located). But now I'm wondering if perhaps they also need to know that the product was produced in China. I have copies of invoices from my Chinese manufacturer, but the prices listed there are my manufacturing costs, not the wholesale prices I'm quoting to the retailer.
Anyone have an idea what kind of document the retailer is actually looking for?