Hi all, With the new client version of Navision the debugging process have also been changed. This post contain details of NAV 2009, NAV 2009 SP1 and NAV 2009 R2 RTC Client. First step is to Stop the Microsoft Dynamics NAV Server Service. Then we need to don EnableDebugging in CustomSettings.config found here: C:\Program Files\Microsoft Dynamics NAV\60\Service. Now start the Microsoft Dynamics NAV Server Service. Now we have debugging enabled. Now start the RoleTailored client. This will take a bit longer to start up, because C# files are generated for each of the objects. (Pages, Codeunits, Reports etc.) - .cs files will be created. In this example I will make a codeunit with a simple message and add this to an action on the Customer list. Create a Codeunit. Ex. 50000 OnRun trigger place the following code: MESSAGE ('Debug test') Save and compile Codeunit 50000. Now let us add this codeunit to a action. Design page 22 and navigate to