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https://blog.devoworx.net/2016/04/05/edits-will-not-be-saved-any-edits-made-to-the-enterprise-global-template-items-are-only-available-during-this-session-in-microsoft-project-2013/
Edits will not be saved. Any Edits made to the enterprise global template items are only available during this session in Microsoft Project 2013