Credential ID in GS1 Credentials

[paulfdietrich]

W3C sets the credential ID as optional in their 1.0 data model the credential ID (all IDs) are optional. I believe our extends mechanism requires that all GS1 credentials contain a credential ID. I could not find a statement in the document clarifying this requirements.

Can we confirm whether credential ID is a required field in all GS1 credentials and update the document to make this clear.