Preventing certain combination of options in a multiple choice question from being selected together

[Kal_Lam]

Welcome back to the community, @jorgelihber! This post discussed previously should help you solve your issue:

How is the syntax for one selected answer where another answer must also be selected in a select_multiple question?

In this case, try this out: In the survey tab of your xlsform: [Image 1] In the choices tab of your xlsform: [Image 2] Data entry screen as seen in Enketo: when a condition is met [Image 3] Data entry screen as seen in Enketo: when a condition is met [Image 4] Data entry screen as seen in Enketo: when a condition is not met [Image 5] Data entry screen as seen in Enketo: when a condition is not met [image] Reference xlsform: Constraint.xlsx (11.4 KB)