Re: Check if work item already exists(SAP-Inbox).

Hi,

As I get it, you are trying to avoid creating duplicate workflow instances for some BOR instance. There is a great blog post about it:

"A grown-up Singleton concept for Workflow instances (3 step approach)"

by Florin Wach 

http://scn.sap.com/community/bpm/business-workflow/blog/2013/05/05/the-super-singleton-concept-for-workflow-instances-3-step-approach