In SDN 4 I can't find DynamicProperties. Is any alternative provided by SDN4 in order to emulate something similar to DynamicProperties that was present in SDN 3 ?
SDN 4 does not support the Dynamic Properties functionality from SDN 3. You can still save and retrieve dynamic properties via SDN 4 if you model them in something like a Map, and then write a custom converter to persist/retrieve them as a String(maybe JSON is a good representation here)