Solution : https://service.sap.com/sap/support/notes/45720 (SAP Service marketplace login required)
Key words : 
additional key words transaction mc94 - change plan, flexible planning transaction mc8q - schedule background job, high-level copying, information structures, info structures, prerequisites preconditions, source code, 'insert/delete', => note 41634
Related Notes : 
       
| 75937 | High Level Copy: incorrect quantities/roundoff |