product_code on the order form/invoice

I edited the quantity php file to show the product code and product name on the checkout and on the email form that goes to the customer, but the product_code des not appear on the emailed invoice/order form

that goes to the business.

What do I need to edit to show the product_code on the emailed order form.

The product_code DOES appear on the order as seen on the backend.

Jim

ADDITIONAL INFORMATION:
I did find the emails section (I was looking in Display/Views earlier) and I added the product code to the email. But I don't know the internal codes because this is what I get in the email.



I get the price not the product_code??

PS I now see why I get the price and not the product code, but my PHP knowledge is not up to getting the correct coding to get the product_code shown, which I would have expected to have been included in this email.

Many thanks indeed, Jerome.

Works perfectly.

Jim