While in Creo 2 or Creo 3 it"s not possible to un-delete/restore a mechanism analysis that was deleted while using the right click menu.
You have to re-open a saved copy of the assembly.
Having the edit definition command next to the delete command in the right click menu posses a chance of the analysis being deleted by accident.
Please make un-delete available for all commands using ctrl-z or the back arrow or a right click command.
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