InputField always be in readOnly mode - OWL screen

Hi all

I have created OWL screen. I want one of input field in selection criteria can be accessed by action script of business object.

Then I started to bind it with one element of Business Object.

After that those inputField turn into readOnly mode. Whereas actions button turn enabled (before I did the binding it can not be clicked).

Any idea?

Best Regards,

Krit R.