Solution : https://service.sap.com/sap/support/notes/441646 (SAP Service marketplace login required)
Key words : 
attached advance corrections, deletion indicatordrilldown reportingime0, investment program positions, symptom wbs elements, wbs elements incorrectly, terms deletion flag, wbs elements, deletion flag, program error, relevant projects
Related Notes : 
       
| 495726 | Overall plan incrct if WBS elemnt w/ deletn flag in project | 
| 355193 | Incorrect plan/actual if deletion flags in project | 
| 134621 | IM/PS reporting: Plan/budget/residual plan differ |