Solution : https://service.sap.com/sap/support/notes/495766 (SAP Service marketplace login required)
Key words :
internal order master data fields, system displays e_save_index = initial, input parameter i_change_mode determines, order master data, output parameter e_save_index, master data fields, master data processing, parameter i_neglect_fieldselection <> space, input table fields_to_change, aufk field labels
Related Notes :
| 976849 | KAUF_ORDER_CHANGE_BAPIFIELDS: Lock in the table COBRA |
| 353492 | BAPI_INTERNALORDER... exception/message handling |