Solution : https://service.sap.com/sap/support/notes/940080 (SAP Service marketplace login required)
Key words :
clear navigation flag lr_session->mv_navigation = abap_false, insertion set navigation flag, mandatory field check data, missing required entries detected, lr_session->mv_mandatory_missing eq abap_true, deletion start change manager, lr_session->mv_navigation = abap_true, lr_session->mv_mandatory_missing = abap_false, lr_session type ref, insertion method onactiongraphic_button
Related Notes :
| 940341 | Field control for required entries - table view |
| 938972 | Field control: Check for required entries |