[Question] Tax directive income source code error

[dvvdee]

Good day, I am trying to manually add a certificate for a contract worker on Easyfile. She has a tax directive. When I click on the plus next to the Directive Information box, it asks me for the directive number, which I complete, then the Issue date, which I also complete then Income source code with a pull down menu next to it, but when I click on the arrow there is nothing to choose from. When I try and save it like that it gives me this message: "If Directive number is completed, then directive income source code is mandatory" but it does not list anything on the pull down menu. Please help. I inserted a screenshot.