Ervin,
Question was: Suppose I have 2 input fields on MainView. I want the second input field to be disabled untill user fills the first field?
And as per SAP standards.. Fields should should change their behaviour after change in state(which is similar to ECC behaviour).
If we use calculated attribute for 2nd inputfield and user enters something in 1st inputfield .. then he has to trigger some event to run calulated method(may it be standard trigger like lose focus which can be obtained by clicking anywhere on screen, or enter key).
Thats why i suggested Calculated Attribute Concept.. which we are using in our current project and also it is good for better performance.
Thanks
Amey