While developing your own extension on NAV 2018 or "BC under version 15" you have the availability over 2 debuggers: the VSCode debugger and the C/SIDE (or should we call it Windows) debugger. Both serve a somewhat different scenario: VSCode debugger You want to run step-by-step through the code of your extension - being AL code - and from there might step into the code that resides in the NAV/BC installation you are programming against. Most probably the C/AL code of the standard application…