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.