Solution : https://service.sap.com/sap/support/notes/873903 (SAP Service marketplace login required)
Key words :
se38 -> goto -> text elements -> text symbols, 039 predecessors 20 040 predecessor work item 80o, workflow container bor object introduced, individual container element defined, subsequent work item, affects user decisions, checkbox exception classes, predecessor work item, t03 predecessor 20o, previous initializing step
Related Notes :
| 903692 | BWF-BP: Using the _PREDECESSOR_WI work item |