Solution : https://service.sap.com/sap/support/notes/772021 (SAP Service marketplace login required)
Key words :
export parameters ev_internal_value type string ev_is_language_dependent type abap_bool ev_is_unit_code_dependent type abap_bool ev_is_currency_code_dependent type abap_bool, import parameters iv_internal_value type string is_char_id type /ccm/s_object_ext_id iv_comp_id type /ccm/object_id, import parameters iv_xi_value type string is_char_id type /ccm/s_object_ext_id iv_comp_id type /ccm/object_id, import parameters is_char_id type /ccm/s_object_ext_id iv_comp_id type /ccm/object_id ir_char_mngr type ref, export parameters ev_type_code type /ccm/data_type_code ev_data_type_id type /ccm/object_id, returning parameter result type abap_bool, returning parameter type result string, exceptions /ccm/cx_conversion_failed /ccm/cx_object_not_found, table type /ccm/t_ctlg_req, row type /ccm/s_ctlg_req