Solution : https://service.sap.com/sap/support/notes/940341 (SAP Service marketplace login required)
Key words :
call method cl_dpr_ui_services=>add_str_msg exporting iv_msg_type = 'e' iv_msg_txt = lv_message, alias = 'development_projects_ui_wd/page_invalid_1' language = sy-langu, logic class data lr_table type ref, check wd_comp_controller->mv_clean_up eq abap_false, insertion data lr_log_table type ref, data lv_message type string, mandatory field check data, data lr_session type ref, lr_log_table->mv_mandatory eq abap_true, view vi_projects_viewmethod onactioncreate start
Related Notes :
| 942560 | Adjusting the cProjects user interface |
| 940080 | Check for required entries when creating action, table, Gan |
| 938972 | Field control: Check for required entries |