Solution : https://service.sap.com/sap/support/notes/940407 (SAP Service marketplace login required)
Key words :
longer execute parallel master data, cost center/activity type combination, attached program corrections, allocation cost element, relevant support package, exclusive/write access, exclusive/read access, ekcslae lock object, ekcslas lock object, activity type involved
Related Notes :
| 644364 | KP06ff.: Message KI501 with same activity type |
| 643483 | KP26: KI501 for the same activity type |
| 620417 | KP26: Simultaneous master data change possible |
| 79634 | KP06ff.: Lock logic in manual planning |