As always with a very generic question the answer is "it depends" and "what are your requirements".
Have you had a look at the documentation - if not you find it here: https://help.qlik.com/en-US/connectors/Subsystems/SAP_Connectors_Help/Content/Clients/Connector-clients.htm
Thank you for the response.
The requirement goes like this. Currently QlikView extracts data from SAP BI. This needs to be changed and QlikView should now extract data from SAP ECC (which is source to SAP BI) and not extract with SAP BI anymore. So I want to know if the connection between QlikView / Sense and SAP ECC is possible.