Solution : https://service.sap.com/sap/support/notes/203031 (SAP Service marketplace login required)
Key words : 
field/structure    proposal    optionalflg_ocm              rc27x-flg_sel          space, additional key words co01, field typedispo         co_dispofevor         fevor, add import parameter flg_ocm, field 'change process type', import parameters    ref, dictionary structure ord_man, dictionary structure caufv, create structure ord_man, function module co_bt_caufv_upd
Related Notes : 
       
| 607056 | Network: User-defined fields | 
| 203024 | |
| 203017 | |
| 203006 | |
| 174713 |