Solution : https://service.sap.com/sap/support/notes/320834 (SAP Service marketplace login required)
Key words : 
additional key words ale, prerequisites performance problems occur, performance problems occur, newly created clients, logical system affects, relevant application tables, application tables, copy clients, copied clients, logical system
Related Notes : 
       
| 944208 | |
| 446294 | CC INFO: Logical system name and client copy | 
| 428856 | Accounting document is not displayed in the document flow | 
| 330989 | |
| 330737 | |
| 328997 | |
| 328942 | Logical system update in FI documents | 
| 327602 | In table ACCTHD update logical system | 
| 325770 | |
| 121163 | BDLS: Converting logical system names | 
| 103228 | Naming the logical system |