While Running DB upgrade scripts you get the following error message:
Populate/relationship_templates.sql line 115, Error: This {0} cannot be modified because another one with the same unique identifier ({1}) already exists in this Namespace ({2}). params[{'Template'},{'namespace_id,name,object_type'},{'Global'}]
eB Database Upgrade populates a set of Internal Relationship templates. These Templates start with "IR-" and are predefined object relationship templates. The error above is caused when DB Upgrade Scripts finds an existing entry with same name as existing entry with a "-T" appended at the end that conflicts with Relationship template names that are reserved in eB and used within the database upgrade scripts.
IR-[RELATIONSHIPNAME]-T format is used internally by DB upgrade scripts and should be avoided by users for their custom Relationships. If you have any templates that matches this name format you can rename it using the following steps (this example is for template "IR-VITEM_ITEMS" but applies to any of the IR- Templates.:
Hope it will help you to resolve the issue!