Customize class in D365 FO

 Customize class in D365 FO

1. create a extension of the standard class

2. use the expresions show 

[ExtensionOf(classStr(BusinessLogic1))] final class BusinessLogic1_Extension { str doSomething(int arg) { // Part 1 var s = next doSomething(arg + 4); // Part 2 return s; } }