Listing, product ID

Hello, I want to add a product. My product does not have a barcode, so I applied for gtim exemption. It’s seen automatically when I want to fill in my listing form. However, during filling the form I see under “new gtim exception” message:
The validity of a Product ID is checked against the GS1 GEPIR and ISBN.org databases. If your Product ID is not registered with GS1 then the linked ASIN will be suppressed and it may result in removal of your product creation privileges.
If your product does not have a standard product ID, you can request an exemption by clicking here. To learn more about product IDs, click here.

What should I do?