Problem:-
I had faced exception
(i.e Display ID used more than once in
BPEL) while developing Business Process(BPEL) in IIDv7.5.1. Refer below
screenshot for exception details.I would  like to share resolving steps . 
 
Resolving Steps:-
To resolve exception I followed below steps. 
Open the BPEL in text
editor, Search for the ID that is shown in the error (ie.Check for wpc:id(eg:
wpc:id=”25”).Invoke activity in my process have  wpc:id=”25”  . As shown in below screenshot .
  
·        
Again search for the ID (eg:25) that is shown in the error. Foreach activity
in my process have  wpc:id=”25”   . Here
both activity’s using same display id which cause the  exception. As shown in below screenshot.
 
·        
Replace that ID with some other bigger number eg: replace 25 with a
bigger number like 3525, so that the chances of 3525 to give a duplicate error
again would be very less). As shown in below screenshot.
 
·        
Save  the changes. I hope you may understand.
For any question please send  a mail  to mdondetimss@gmail.com