How to calculate a question by adding conditions as well as error messages if conditions are not met

[Kal_Lam]

You could do this as discussed in our previous post:

First approach:

How to validate the female and male entries with the total entry

Hi @Sylvain_DOAMBA, Simply expanding what @stephanealoo has advised. In the survey tab of your xlsform: [Image 1] Data entry screen as seen in Enketo: (wrong entry) [Image 2] Data entry screen as seen in Enketo: (wrong entry) [Image 3] Data entry screen as seen in Enketo: (correct entry) [Image 4] Reference xlsform: Calculation.xlsx (9.1 KB) Have a great day!

Second approach:

Validating a response based on previous questions

Welcome to the community @horekultura! You could do the same as outlined in the image shared below: In the survey tab of your xlsform: [Image 1] Data entry screen as seen in Enekto: (when a wrong entry is made) [Image 2] Data entry screen as seen in Enekto: (when a correct entry is made) [Image 3] Reference xlsform: Constraint.xlsx (9.0 KB)