Solution : https://service.sap.com/sap/support/notes/603388 (SAP Service marketplace login required)
Key words : 
transferring locations reason, attached source code, change document management, prerequisites performance problem, integration /sapapo/dm_location_maintain, performance problems, change documents, /sapapo/loc_maintain_bapi, /sapapo/loc_maintain_cif, transfer customers
Related Notes : 
       
| 766827 | Composite SAP note: Performance SCM 4.0 |