SAP-BW Config

[Cognos8]

I installed and configured C10.1.1. While executing the SAP report i got the below error. datasource test connection succeeded.

"XQE error encountered: XSB-ERR-0091 A problem has been encountered with the SSO Ticket from an SAP NetWeaver portal for the connection"

I did 2 configuration changes for SAP specific. do i need to do anything else?

1) placed 64 bit librfc32
2) updated the below value to zero
null.plus.operator=zero
null.minus.operator=zero
null.multiply.operator=zero
null.divide.numerator=zero
null.divide.denominator=zero
null.modulo.dividend=zero
null.modulo.divisor=zero