Solution : https://service.sap.com/sap/support/notes/416957 (SAP Service marketplace login required)
Key words :
additional key words archivig class, archiving class ps_project, archiving classes ps_project, including tables pserb, archiving class ps_element, implemented note 381563, transaction acla, ps_element, defintions, prerequisites
Related Notes :
| 447435 | Deleting activity with summarization: CL585, C6018 and other |
| 381563 | Archiving: Deletion of summarization data |