Solution : https://service.sap.com/sap/support/notes/1234475 (SAP Service marketplace login required)
Key words :
maintain system data, flag 'generate systems', unwanted customer number, wrong customer number, batch job refresh_admin_data_from_support, maintenance view v_aisapcustnos, customer number, systems typically, error messages, exist anymore
Related Notes :
| 1151450 | FAQ: Managing several customer numbers - Support Package 15 |