Solution : https://service.sap.com/sap/support/notes/182652 (SAP Service marketplace login required)
Key words : 
additional key words gdbpsget, find assigned correction instructions, project information system, full table scan, attached coding repairs, tables m_prpoa, internal order, production order, database oracle, networks exist
Related Notes : 
       
| 401949 | Long validity periods in PS reporting III | 
| 339596 | TIME OUT whn insertng WBS in prjct (ORACLE problem) | 
| 209322 | Problem in ORACLE with initial values IV | 
| 200228 | Performance problems in PS under Oracle | 
| 197749 | Problems with initial values under ORACLE, III | 
| 180911 | Problem in ORACLE with initial values | 
| 143524 | Long runtimes in PS Reporting |