Can anybody tell me how we write validation formula for "single line of text" fields in SharePoint list that it accepts characters only.
I think without SP Designer is this not possible. There are following functions available: ISBLANK ISERR ISERROR ISLOGICAL ISNA ISNONTEXT ISNULL ISNUMBER ISTEXT See this reference: http://office.microsoft.com/en-us/sharepoint-foundation-help/is-functions-HA100405908.aspx