First, I cannot print labels for purchases order because I need to set up bar code for the combination...
I really don't know what this means and I don't find information about this.
Secondly, I manage to assign a template to the product label option but not the Shelf label option. To do so I right clicked on "report name" then I went into View details.
Then it sends me to a page without a name or a path.
Adding templates there add them for the product label but not the shelf label.
See pictures