Solution : https://service.sap.com/sap/support/notes/371146 (SAP Service marketplace login required)
Key words :
additional key words default variant, activated default layout /default handling, se24 class builder cl_alv_variant, default layout handling, layoutsap list viewer, abap list viewerbuffer, export/import bufferfbl3n, selected check box, attached correction instructions, click button parameters
Related Notes :
| 365546 | ALV buffer: you cannot select variants |
| 339258 | ALV buffer: concept, recommendations and known errors |
| 319136 |