"Read only" Error for Oracle forms test

Hi,

I'm testing an Oracle forms appliation using VBscript Unit.

I got the error "failed to enter text in the edit box, since it is read-only". 

I added a delay, I tried by recording the steps and it is not working too.

Any help please, how I can deal with this error. I used the hierarchy to get the object and it is working for the others textbox but not for this one.

set z = Sys.Browser("iexplore").SwingObject("...","...")....