Dear gurus!
I intend to take the weight of newborns using my ODK form: the data type is
decimal.
How do I make to allow only numbers to 1 d.p for example(1000.9 but not
1000.91)
please I am sorry if the trend is already on? I just could not find it.
Akum
Hi Akum,
Long time, no chat 
You'll have to use a regex constraint in your form. In your constraint
column in the form, put regex(., '\d+.\d{1}'). That will match one or
more numerals, a period, and one numeral. You can test this regex at
https://regex101.com.
I haven't tried this out, but because it's a decimal, you might run
into an issue where ODK is storing it as 1000.900000 or something like
that and then your regex might fail. If you find that is a problem,
use the data type text with an appearance of numbers.
Hope that helps!
Yaw