it seems to be R/3 and BSI is not integrated through RFC connection.
check with your basis consultant to avoid this error.
correct me if i am wrong...
This issue is common amongst customers upgrading their BSI 9.0 issue,
and development have created an FAQ note which will help you.
Please review the SAP note 1484771- FAQ: TaxFactory 9.0 Inst./Upgrade
Specifically, please refer to point 6 in the note:
6. We connected SAP Payroll and TaxFactory 9.0 successfully, but when
we run program RPUBTCU0, we encounter a System failure error. How
can we resolve it?
Thanks and Kind Regards