Did you solve the problem? I have the same situation, and i make this workflow: Create an approval event, and then a multiplexer with the class that need to be approved before publish. But it didnt work. When users create content, all classes use this workflow. Please, help me if you can.
A late reply, but perhaps it can still be of use to others..
If I understand you correctly: You have to add the multiplexer before the approval workflow. In the multiplexer you specify the approval workflow as the one to run for your articles.
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