ERPNext is a highly complex product having more than 200 inter-connected tables (DocTypes). The visualization below shows relationship between 50 DocTypes selected based on the frequency of occurrence of its link. If you hover the mouse on a particular DocType's arc (box on circle's rim), you will be able to view its relationships in isolation.

To view a larger version and see more relationships or if the above diagram appears distorted - Open it in a new window

Curious on how this was created? Check out its source. The code has instructive comments.

This chord diagram was created using d3.js