Solution : https://service.sap.com/sap/support/notes/352535 (SAP Service marketplace login required)
Key words :
symptom drilldown report 12kst1i, sap project system, report/report interface, ldb psj reason, drilldown reporting, hierarchy report, select data, error occurs, implemented note 317171, respective objects
Related Notes :
| 354592 | KH178: hierarchy 0SAP is not unique (12KST1I) |
| 317171 | Jump to line item report w/o authorization verification |