You can also list top workitems with errors in Workflow. SAP List viewer in ABAP system is used to view the workflow with errors and these are grouped based on error reason. Following are the possible causes of workflow errors −
You can access the processing of workflows with errors navigating to this path: Tools → Business Workflow → Administration → Workflow Runtime → Diagnosis of Workflows with Errors.
You can use T-code: SWI2_DIAG (Diagnosis of Workflows with Errors) - which is defined as the standard SAP code available within R/3 SAP systems depending on your version and release.
You can see the error cause in the workflow diagnosis and also “Restart workflow” from here.