SharePoint List column validation related to another item

Question

I have a SP list with 3 fields:

• "report type" (choose list "A", "B" or "AB")
• "Type A due date"

• "Type B due date".

  1. I want to set-up column validation for the due date so that "Type A due date" is required only when "A" or "AB" was chosen in the "report type" field. any idea?

  2. Bonus question just coming to me (but I assume I could do it if I find solution to question 1): How to have an alert is a due date is selected while the related report type was not checked?

Many thanks in advance for your help!

Answer 1

You can achieve this using list Validation settings. use below formula:

=IF(OR([report type]="A",[report type]="AB"),IF(ISBLANK([Type A due date]),FALSE,TRUE),TRUE)

Calculated Field Formulas.