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One way I discovered was that we can type a formula in validation settings for a list or library. For Example : [File Name]=[Title]&"-"&[Analyst Name] , which produces a file name such as MerchantDetails-Abhishek !

But again the problem here is that this doesn't works for look-up columns. I am just a beginner in SharePoint, so any help would be much appreciated.

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You cannot use lookup fields in Column validation in OOTB in formula.

You will have to use the client object model(JavaScript, jQuery), or item adding event receiver (custom code) for column validation.

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