Certain Derivatives (Banking Contracts) can have very complex Service Flows.
Legislation can prevent Banks and Brokers from talking to each other and as a result neither side is not fully aware of how the other side's business practice.
When a Derivative Trade has a discrepancy, it can become diffiucult to find out where and how the mistake occured.
By making a Service Flow Diagram, the full scope of the service could be seen by both sides, which was a revelation to certain members of the team.