I want to learn the ERP system. For this, I want to study its processes. Therefore, if someone can give me useful links, then it will be useful for me, thanks.
You can find something useful here.
Model Oriented ERP Implementation
UML diagram
Check out the Silverstron Data Model Resource Resource Series. Not UML ... but close. Volume 1 , Volume 2 .
There are many ERP systems, most of which are designed for a specific industry, sometimes even for a specific corporation.
So, first you need to select a specific ERP system, and then analyze it. A good starting point would be a list of ERP systems at SourceForge .
Another starting point will be this document on the general use of UML diagrams in ERP systems.
This is typical UML, I was looking for the same thing as you to show this to the client, and this is the best example https://creately.com/diagram/example/hn34ipx61/ERP