Hi! While updating model mapping from 'Level 1 Data Hub' to 'Level 2 Supply Chain' workspace, I was able to do it successfully.
Post the mentioned activity steps, when I got an error while running an action (9. Import Data from Hub) - I realized couple of the 'source object' has not been mapped (marked in 'red' box) to my Data Hub model. While I can see that for two line items (marked in 'green' box) it has got updated. (Image attached)

Tried troubleshooting but couldn't find the exact issue. Can someone please help? Thanks!