Solution : https://service.sap.com/sap/support/notes/1436329 (SAP Service marketplace login required)
Key words :
start parallel deletion jobs, execute transaction slg2, additional selection criteria, individual deletion jobs, relevant support package, deletion interval reason, subsequent deletion runs, deletion program sbal_delete, parallel jobs, parallel deletion
Related Notes :
1460194 | Report RDELALOG does not delete any entries of BALHDR table |