Entity Relationship Diagram in Ax 2012 ( New Creation and Existing ER)

ER Diagram for System Default Table in Ax 2012 for all Modules

https://www.microsoft.com/dynamics/ax/erd/ax2012r2/

And We can also create new ER diagram for our Customize Table (New Functionality) also by using Below Link tutorial

https://www.visual-paradigm.com/tutorials/reverse-ddl.jsp
.bak
.sql

.sql and .bak file to Reverse ddl to make ER in SQL server 2012