Solution : https://service.sap.com/sap/support/notes/310038 (SAP Service marketplace login required)
Key words :
user exit returns parameter no_dialog = 'x', user exit returns valid usages, additional key words userexit, information dialog boxes, suppress dialog, transaction terminates, error message 29507, selection made, screen selection, table wultb
Related Notes :
| 394062 | CS20: Data of the initial screen in the user exit |
| 319287 | CS20: User Quits: No usage selected |
| 180686 | CS20: Basic note for new version |