Solution : https://service.sap.com/sap/support/notes/1034863 (SAP Service marketplace login required)
Key words : 
mrp based excise duties, goto function group j1i7, prerequisites legal change, function group j1i7, run transacion 'se80', press 'create' button, function group 'j1i7', xkomv type spec, bed_amount type spec, aed_amount type spec
Related Notes : 
       
| 1159653 | Adding KOMK and KOMP to J_1I7_EXIT_DIFF_DUTIES_IF_MRP in 352 | 
| 1043669 | Userexit J_1I7_EXIT_DIFF_DUTIES_IF_MRP in 352 routine for SD | 
| 1032265 | Budget 2007-Legal implications |