I have 4 checkboxes and if I select any the others must be deselected. I'm using each one's FieldUpdate property, but it only works with Internal Budget with Vendor # 1, # 2, # 3 and # 4 not working.

I show an example of how I am using the Field Updated event.
InternalBudget FieldUpdated

Vendor_1 FieldUpdated

Enable commit changes property for each field but only works with InternalBudget. Anyone who can help me please?