Solution : https://service.sap.com/sap/support/notes/399312 (SAP Service marketplace login required)
Key words : 
linked ps objects, document info records, additional key words, prerequisites solution implement, wbs element, network activity, material component, processing transaction, transaction cv02n, project builder
Related Notes : 
       
| 536508 | Composite SAP Note on 'Documents and PS' | 
| 523811 | |
| 494487 | Project System: Consulting notes | 
| 398216 |