No, it is the GTIN on the product that is to be introduced. However, all documentation for the product, such as eBVD, iBVD, SDB etc. needs to have a corresponding GTIN to be able to be connected to the product.
Existing trade item information, sent without GTIN, needs to be resent with GTIN filled in.
The discussion about Data Templates is handled and processed in other forums. A prerequisite for DT, however, is always that the products can be identified and tracked with its GTIN. You then also get the opportunity to take part of product information and product data connected to the product.