Hi FolksJust sharing the experience!When writing to child record via write record, there was no error on process model, but it was still not writing to DB.
Then we realized the issue was because of two reason which we did not pay attention
1. We need to make sure the record object is updated o latest version means below pop should not be visible
2. On the model switch to latest version of smart service.
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To be clear, updating the record type will ensure that rv!record will automatically include everything the start process form requires. It doesn't impact Write Records directly, but you could probably see the difference in the record variable constructed in your process. You can also check the variable in the process execution to see what is passed in to Write Records. Regarding the version, looking at tools -> documentation in your process main toolbar, you can see the version of the node.