Note that if you are not seeing the error 'function==null' in '/SBB/UC4_JOB_VERSION_CHECK' call.
and only "Function 'GetJobSpool' is not available in the current SAP interface", check first that SAP_BW is enabled in the SAP agent ini file.
1) Open the SAP agent ini file
2) Make sure that:
[SAP_BW]
Enabled=1
If it's 0, change to 1 and restart the SAP agent.
If none of the steps resolves the error, please log a ticket with Automic Support and attach the SAP agent logs and SAP job report.