Solution : https://service.sap.com/sap/support/notes/1046798 (SAP Service marketplace login required)
Key words : 
xpra report ignores roles, enhanced roles concept, 'role id' field, run report r_dpr_project_roles_xpra, incorrect database entries, xpra r_dpr_project_roles_xpra, higher release, checklist templates, project templates, terms dpr_part
Related Notes : 
       
| 1265980 | Trigger automatic execution of R_DPR_PROJECT_ROLES_XPRA | 
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| 1088160 | cProjects 4.5 - FAQ note | 
| 1075658 | Exchange upgrade to Basis 700 with CPRXRPM 450_700 | 
| 1075655 | CPRXRPM 450_700 installation/delta-upgr to SAP_BASIS 700 | 
| 900310 | cProjects 4.0 FAQ: General notes |