SAP BI 7.0 @ Data sources from MS SQL Server 2005

HI everyone:

i need to conect my BI 7.0 System to external source Microsoft Sql Server 2005,

i try to connect by RSA1Source System -> DB connect -> create source

type the logical system, description, and type, the next screen have field for datails of connection like dbms (MSS) User, password etc.

so, save the entry, but return the code error, No RFC

someone have some procedure to apply this connection to remote DB.

Best Regards