I suggest you to show the result of your condition on a label so as to see what values you are expecting.
Fernando,
It has become very interesting. At first I was using Operators in my Rule formulas -- for example:
{ItemProperty:Abc} == 'Groundwork'
This worked at first, and then stopped, which was when I posted the first item in this thread. Nintex Support very helpfully told me that some mobile platforms have trouble with operators, and thus I should use the inline functions equals(), not(), greaterThan(), etc. So I changed my formulae to, for example:
equals({ItemProperty:Abc}, 'Groundwork')
This still did not work on the Mobile app for iPad -- until I changed the single quotes to double quotes.
This then worked at first, and stopped working again. More specifically, the FIRST time I open a task form in the Mobile app, all of the formatting and validation rules work. But then if I close the form without submitting -- all the rules fail from that point on. The rules only work the first time you open the form (iPad and Android phone).
We have a call with the head of global support and our customer today and should have a solution soon.