There is no an official connector to SAP Supply Chain Event Management (SCEM)
You can post in our Ideas section in order to get it implemented. The more votes you got the better chances you have to see it implemented.
The best practice solution, when working with unsupported data sources, is to mirror the unsupported data source onto a supported data source (such as SQL Server, MySQL, Oracle, etc.) and then connect to the database using the native data connection.
It may work if in this case connect or mirror SAP SCEM data to a Supported SAP datasource and then connect Tableau Desktop to SAP supported datasource (HANA,BW, SybaseASE, Sybase IQ)
Please see the following resources for additional information about the capabilities and limitations of connecting to unsupported data sources via generic ODBC:
I hope this information helps