DB CONNECT Issue

Hi

I am trying to configure the DB Connect in SAP BI to connect Oracle database. Please write to me, what is the entry

that needs to be entered in SSID and SAPDBHOST. I have pasted the entry in the TNSNAMES.ORA file

IISTEST =

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.87.10.13)(PORT = 1521))

    )

    (CONNECT_DATA =

      (SERVICE_NAME = IISTEST)

    )

  )

Please note that I am getting error ORA-12154 error in SM21 transaction, when I checked this error, it means that

TNS:could not resolve the connect identifier specified. Kindly give your inputs, how to resolve this error.

Thanks

Bala