A standard english form published to the mobile app is causing a problem with number fields when opened on an ipad with Indonesian regional settings.
Indonesian numbers are written the same as english numbers. So I'm not sure why the field would give an invalid message.
When he changed the regional settings on the ipad to US, the validation error went away.
This is a bit of an issue as I'd like him to be able to read text in Bahasa. And really number fields shouldn't error with a correct number type entered.