Operations not successful(Export,Checkout) by DFC code

Hi,

I was facing a strange issue in DCTM 5.2.5.
When I tried to export a document by a DFC code, code is running fine without any errors, but at last it's not getting exported.
I have checked all the options, but they were useless.
Than I tried to export it manually, and found that it's getting exported.
The same thing happens, when I tried to checkout a document.

Than after investigation, I found that when I tried to execute Export or Checkout manually, it gives a pop-up java applet every time to click Yes. Once I set it to remember all the time, the operations are getting easily executed.