The attribute ‘identifier exists’ and value ‘FALSE’ should be used for:

The attribute ‘identifier exists’ and value ‘FALSE’ should be used for:

  • A) Items as part of a bundle
  • B) Used electronics
  • C) New books for pre-order
  • D) Custom-made clothing

The correct answer is:

  • D) Custom-made clothing

Explanation: In the rare situation where your product has neither a GTIN nor MPN (for example, made-to-order or handmade items), set ‘identifier exists’ to ‘FALSE’ to indicate that you have no identifier for the product.

Read more here: https://support.google.com/merchants/answer/160161?hl=en