When you create a Bundle as a Product (BAP), an actual product gets added to your list of products on your Shopify admin panel. Like any other product, the BAP must have a Stock Keeping Unit or SKU.
Fast Bundle sets a default SKU to the BAP
When the BAP is created, Fast Bundle sets a default SKU for it in the Shopify panel.
Like this:
Or if the BAP has variants:
