Defining RFCUSER as Default 
Note
This step is valid on SAP BI and SAP SCM systems only.
On your SAP BI system, call transaction RSA1.
On the Data Warehousing Workbench: Modeling screen, in the menu bar, choose .
On the Display View “RSADMINA Maintenance View”: Details screen, choose .
In the BW User ALE field, enter <your RFCUSER>.
Save your entries.
Leave the transaction in order to activate the entries you have made.