Issues with constraint

@alazar_baharu, maybe you could do it as outlined in the image shared below:

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:

Data entry screen as seen in Enketo:

Data entry screen as seen in Enketo:

Reference XLSForm:

ttt.xlsx (11.3 KB)