Solution : https://service.sap.com/sap/support/notes/434155 (SAP Service marketplace login required)
Key words : 
parameter idprps      pspnr    peivorgnet  aufnr    anr          vornr    vngmatcomp  rsnum    res          rspos    rpo, additional key words, key fields, transaction cv03n, display transaction, object links, wbs elements, network activities, material components, transaction od11
Related Notes : 
       
| 536508 | Composite SAP Note on 'Documents and PS' | 
| 494487 | Project System: Consulting notes |