E.g. In a "Project Cost" list, user must fill "Budget Amount" field value if "Budget Approved" field's value is set to "True".
Solution: Here is how to implement a required field validation based on other column's value in SharePoint 2013.
- Head on to List Settings
- Click on "Validation settings" under "General Settings"
- Enter the validation formula as: =IF([Budget Approved?]=TRUE,IF([Budget Amount]="",FALSE,TRUE),TRUE)
- Enter the user (error) message accordingly. I've entered "If Budget is approved, you must specify the value of Budget Amount!".
- Click "OK" to save your changes
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