Solution : https://service.sap.com/sap/support/notes/162987 (SAP Service marketplace login required)
Key words :
incomprehensible message 'assigning pm order, wbs element <wbs-id>, message class cj, additional key words, transaction se91 create, message number iw516, wbs element, wbs element &, internal order, system generates
Related Notes :
| 188038 | CJ20, CJ2B: PLNAW_UNKNOWN_LCOVGFFR |