Unable to edit Webdynpro views

Hi,

I'm facing a strange problem. I've checked-out my Webdynpro dc from DTR. Now, I want to make some changes in the code, but whenever i try to write anything, it is not displayed in the screen, i.e. it is not allowing me to make modification. I've checked the read-only property of view and it is un-checked.

1) Could you plz tell me what is wrong with the DC?

2) Why it is not allowing me to make any modification?

PS: I'm using NW04 SP16

Thanks & Regards

Abhinav