Pardon this newbie question on SharePoint list validation, I have been researching this for days
SharePoint 2013
SharePoint LIST validation since you cannot compare two fields in FIELD validation
- Two fields in same list:
field#1 -- Employee's Email Address
field#2 -- Vendor Contact Name
- Validation - If both fields contain data then don't allow the form to save. Basically if either field is blank allow the form to save.