Travel Request Approval Screen attachment launching a r3 screen to launch

Hello Experts,
               When i  trying to open a Travel Request Approval workitem id , it open me a screen in which the overview of the travel request is visible with a attached file.

            When i click on the attachment , it launches a r3 screen  and when from their i click "Travel Details", it launches that pdf file.

I just what a attachment to get open when i click on the attachment not the r3 screen.

Its refering to TS20000118.
But i cant find any entry related to this Task in SWFVISU.

We are on 7.3 ,n installed MSS add on

Kindly suggest.

Thanks.

Regards,
Prajakta K