Vanilla uses 1 tab for indentation rather than spaces. Consider using a source control system like Git and a collaborative forge like GitHub to manage team collaboration, or just make a copy of the file somewhere else. So choose a name, no one else will ever use, like the name of your mod. (Your files can have any name, all files in the folder will be loaded by the game.
Use a good text editor (like Notepad++, Sublime Text, or Visual Studio Code) to edit files and search into multiple files.Never modify game files: use a mod even for small changes, and never modify directly game files in Steam Hearts of Iron 4 folder, as your changes may be undone without warning.
