Introduction
In every SAP Customers you will work for SOD(Segregation of Duty) Process is very critical for the Company as they want to make sure no Fraudulent stuff is going on. It is also very important for Semi-Annual or Annual Audit from External as well as Internal Audits.
Solution
This blog covers the different Do's and Don'ts. One thing I would like to emphasize that this is just My view and may not be applicable for every Industry. Based on the Industry, Country and Workforce Count this may change.
Vendor Master Maintenance Role

RFQ Role

Buyer Role

Accounts Payable Team

Contract/Sched Line Creator

Goods Receipt/Service Entry Sheet Creator

Conclusion
Please use this Blog as a Startup point to check SOD process.
Below is the video version
https://youtu.be/CaY3ocWgT8U
https://youtu.be/68neYc9tSWo
https://youtu.be/UvkmZOhc2co
https://youtu.be/rDNbJXa7eK8
https://youtu.be/AQmCk5HgK_U
https://youtu.be/edE5y7hsHCM