Quote:
Originally Posted by sfkeydel
If you select "All Items" in the Perspectives menu, you'll see all of the completed actions in the project. Basically, OmniFocus is telling you that, if you delete the project, you'll lose your record of what you've done.
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It's a bit more general than that; it will warn you about deleting the project or folder if there are any items in it not currently visible. The usual case is completed items, yes, but if you are viewing Available or Next Action, for example, it will also warn you of the presence of items with future start dates.