Hi Letz,
Workaround:
Modify the multisource-enabled connection properties again and republish the business layer to the same location.
Note:
The new and enhanced features in the information design tool available in SAP BusinessObjects BI platform 4.1.
The federation layer, available only in multisource-enabled data foundations, lets you create federated tables that can include data from any of the data source connections defined in the data foundation. Federated tables can be inserted into the data foundation and used to define the schema on which the universe is built.
In the Data Foundation Editor, the new federation layer pane lets you graphically design a data flow composed of data source tables and federated tables.
Please refer the below link for more information on this.
http://help.sap.com/businessobject/product_guides/sbo41/en/sbo41_whats_new_en.pdf
https://websmp107.sap-ag.de/~sapidb/011000358700001392242012E.pdf
Hope this information helps you...
--Raji. S