Firstly, we are not able to directly connect to SAP R/3 (SAP ECC) from Power BI, an idea about this issue has been submitted in this link, please vote it up.
Secondly, you can review this article about how to connect to SAP R/3 from SSIS, if you have any questions about transferring data using SSIS, please post the question in SQL Server Integration Services forum. After moving data from SAP R/3 to SQL Server table, you can connect to the table from Power BI Desktop.
Thirdly, as far as I know, it is not possible to connect to SAP R/3 from Azure Data Factory, please vote this idea and post the question in the Azure Data Factory forum.
Thanks, Lydia Zhang
Community Support Team _ Lydia Zhang If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.