Solution : https://service.sap.com/sap/support/notes/956824 (SAP Service marketplace login required)
Key words :
optional import parameter, function module bapi_servnot_add_data, service notification, terms notification, i_bapi reason, program error, implement note 955323, manual acitivity, likereference type, bapi20783t-status_inddefault
Related Notes :
| 960482 | I_BAPI Parameter added to Businees Object Repository |
| 955323 | Locks not considered during Notification change through bapi |