Solution : https://service.sap.com/sap/support/notes/594845 (SAP Service marketplace login required)
Key words :
symptom long runtimes occur, create db index, knufor table vbak, table vbak, -unique-index, index fields, program sdbont01, view v_vmvaf, field knuma, terms performance
Related Notes :
| 942042 | Performance problems when rebate agreement is displayed |