Solution : https://service.sap.com/sap/support/notes/631507 (SAP Service marketplace login required)
Key words : 
start transaction se11 select type group frm35, choose 'change' change type frm35_ty_s_key_matrix, recn     type frm33_key_type, recn_alt type frmle_recn, include  type frmlsmatrix, program error solution 1, type group 2, entered input substances, tab page 'composition', component type
Related Notes : 
       
| 654819 | Component type taken into account only for output substances | 
| 631420 | RMGMT210: Corrections in Support Package 04 |