Validation condition in numeric question - not null

How can I create a validation condition stating that a numeric question MUST be completed? i.e. numeric question cannot be missing.
Something like:


Thank you for your help. This sounds very basic to me, but I could not find it in the forum or the documentation. I could add an enabling condition to all the following questions, but I hope that’s not the answer… Maybe there is a reasoning failure in my question, all ideas are welcome.

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