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I am attempting to make a condition where someone is inputting a new item on a list but for three specific fields, end users can only fill in one of those three. I can't figure out the formula syntax.
You can use PreSaveAction() on new form of list to validate these fields using script editor or adding content editor web part.
Here is how to add script editor in sharepoint.
You can find more details about content editor, here.
And here how to use PreSaveAction().
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