Column Validation Settings for a mandatory choice

Question

I have a SharePoint 2013 list with 3 dropdowns of which 1 must be selected. It doesn't matter which is selected as long as one of them has data. I tried to do the Validation Settings:

=IF(AND(ISBLANK([Initial Pleadings])=TRUE,IF(AND(ISBLANK([Memos or Motions])=TRUE,IF(AND(ISBLANK([Other Filings]=TRUE))

but it doesn't seem to take. I want a message to pop up saying that the user must select a document type. I'm having a hard time getting it to work. Any help would be greatly appreciated.

Answer 1

Try this

   =OR(
       NOT(ISBLANK(FirstColumn))
       ,NOT(ISBLANK(SecondColumn))
       ,NOT(ISBLANK(ThirdColumn))
      )

You need OR rather than AND

More information about OR here and AND here