Hi Wolfgang, your’e welcome.
If you use only distinguished fildes – you don’t need any property schema.
If you will need at any moment to promote some properties, let’s say in custom component for incoming message, in custom piepline, you can create property schema, and choose fields you want to promote. In current project for example, we use some fields of messages as distinguished (to get some values with this sintax: “value = message.FieldValue”; ), and some values we get from incoming message, and promote it to context for routing of messages afterwards.
So, it’s up to your decision and architecture.