To check whether it is a Qlik issue or Sharepoint. I suggest you to use POSTMAN and connect to the SharePoint URL and try fetch the same data. Please read the SharePoint documentaion or check the Configuration document to find out the difference between the SBU and Service_x0020_Line.
I am thinking that "Service_x0020_line" has restriction on SharePoint end or it is not queryable/readable.
I holpe this help's you.