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How to validate lookup control linked with a mandatory field?

Question asked by on May 15, 2018
Latest reply on May 15, 2018 by

Dear All:


I'm just now very confused with the validation of a lookup control. I've tried a lot of formulas but they don't work. Here is:


I have one lookup control linked with a mandatory field:

"ZonaSubzona" is mandatory field:



  • Without validation rule, in you don't choose an item in the lookup, the field will be empty and nothing happens.
  • Using a validation rule in the lookup control, like:

(esnuloOEstaVacío means IsNullOrEmpty)


  • Another formula like {Self}=="", it doesn't work
  • Using validation into control properties, it doesn't work

If someone can help me I promise to invite him a beer here in Spain...

Have a nice day!