SAP BW connector invalid MDX command

[blairzy1]

I'm using: Power BI Desktop (April 17 release) I'm trying to connect to SAP BW using the now standard SAP Business Warehouse server connector. SAP NW RFC SDK 7.20 downloaded and extracted. The .lib and .dll files all plonked into my system32 folder. When I use the connector I can see the Cubes in BW okay but when I preview or import I get an error message:

DataSource.Error: SAP Business Warehouse: Invalid MDX command with Details: DataSourceKind=SapBusinessWarehouse DataSourcePath=drapppsap30/16/510 ErrorCode=-2147467259 Any ideas ?