XLSForm: How can I constrain one variable to be lesser than another one?

For example: With two variables a1 and a2, where you want a2 to be lesser than a1, you can enter the following syntax in the constraint column of the a2 question:

. < ${a1}.

Note: When you want to refer to a specific question, always put the name between {} and preceded by a $.

num_constraint_eng

Category: Create a New Questionnaire, Questionnaires, Questionnaire > Overview, Create Questionnaires, Questionnaire > Questionnaire

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