Solution : https://service.sap.com/sap/support/notes/595094 (SAP Service marketplace login required)
Key words :
symptom long runtimes occur, long runtimes occur, source code corrections, conversion exit reason, conversion exit, wbs elements, selection screen, project system, terms 0project, master data
Related Notes :
| 454004 | PSBW: PROJ and WBSEL conversion exit |