Decision Sets 
Decision sets are groups of items of a purchasing document in an approval process.
Purchasing documents, such as shopping carts, can contain items belonging to different areas of responsibility, for example different product categories. Each area can have a different responsible agent. Instead of sending work items to a single agent, or to one after the other until the whole document is approved, the items of the document can be grouped into disjoint decision sets. A work item is created for each decision set. The responsible agents can view all items of the document, but can edit only the ones they have been assigned. All other items are inactive. The next process level can only be activated if all decision sets have been decided upon.
The system can determine the number of decision sets in two different ways, depending on your Customizing settings:
By way of a context function that analyzes item data
By way of the organizational plan
Note
In the common line manager approval, the system does not create several decision sets. This is because the entire document is decided upon by the requester's direct line manager.