To have overall understanding of SAP Business Workflow, please refer the below link.
Very common Problem :
Error 1. Output Device “” Not Known :
While you tring to generate Background job for any of the workflow activity.
You will get error : Output device “” not known
Resolution : Assign a valid printer to WF-BATCH user –> SU01 (Security/Basis team can help you).
Error 2 – Work item -: Background job SWWCOND cannot be scheduled (Error)
Assign SAP_ALL and SAP_NEW profile to user WF-BATCH. Then try to generate Background job.
1251255 – Authorizations for the system user (WF-BATCH) : This will help to expain, why we do require SAP_ALL and SAP_NEW access.
Thank You. I will add more error’s resolution here only if I come across of them.