A workflow log can be linked with one or more business objects. It also usually consists of several workitems. In the DRB, the complete workflow log is an object to which the corresponding business objects are linked. When you display the workflow, the complete workflow log is displayed.
There is no access to the DRB based on workflow logs or workitems. You can only find workflow logs using objects that are linked to them.
To find and display archived workflow logs (archiving object WORKITEM), you need and active and full archive information structure for field catalog SAP_BO2WI_001.