I am able to map some of the attributes using import_attr_mapping method. Please see pic below. I am curious why some of them are not mapped. Referencing to the guide, it did not mention what type can be mapped. From the test, I assume only "persistent" attribute can be mapped, no runtime, no reference, no relation. But they can be done with feature properties. Do have a IR with GTAC, but she is not helpful last time, don't expect give me answer this time. I hope to get answer from experienced experts. Appreciate your reply!