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I am uploading legacy drawings for clean up purposes. Some of the drawings are released as restricted revisions ( I, O, Q, S, X, and Z). How can I override this schema to allow this?
Take a look at this article on setting revisions on new documents:
You will need to go into the preferences of Windchill and change the restricted revision list. That still may not allow those revisions if your revision rules file does not have them in the list.
I would not advise changing the revision rules list as including those revisions will always make them available for all future objects. My suggestion is to put them in to Windchill at the next revision and either note it in the object or the comment section.