Hi Erik, Luc forwarded this to me, as he thought I might have an answer. :-) The .Net code looks fine, so the only thing that I can think of is the way you have deployed the dll file. Did you create and deploy it more than one time? It could be an idea to close the development environment and then clean the NAV add-ins temp folder. That folder can be found in %TEMP%. Also make sure that you have just one version in the add-ins folder of the server. It's not needed to have it in the add-ins folder of the development environment (unless you are using NAV 2013 R2 or older). AJ
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