Hi,
In many ways you can add different validation conditions to the process form. But the question is where should it be. First, I can add a validation rule in the Web/InfoPath form itself. On the other hand, the user can use K2 Workspace to action the work item and here's the real issue. No validation rules will be applied and the user can bypass them which makes those conditions kinda useless.
Do you think that the validation rules should be part of the process model "K2 Process" rather than the Web/InfoPath Form?
-Saleh