@mkananizadeh Also, after all the trouble, I found the issue: the issue is when creating a connection, I need to have the demo. in front of table CUSTOMERS, so table to include should be demo.CUSTOMERS. Before I though since I put the demo to the include database field, so I only need CUSTOMERS in the include table field. Apparently that not the case, always need demo.CUSTOMERS. Please see the screenshot.
Thank you for your help!