Missing value

[Kal_Lam]

@nohandoye, you could also do it as outlined in the post discussed previously:

Date control for a range with options to enter a don't know response

Hi @absiche_2692, You could do the same as outlined in the image 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] Data entry screen as seen in Enekto: When a correct entry is made [Image 4] Reference xlsform: Constraint Test 2020 09 07.xlsx (10.1 KB) Have a great day!