Solution : https://service.sap.com/sap/support/notes/400860 (SAP Service marketplace login required)
Key words : 
additional key words alv, abap list viewer, attached program correction, user parameter sd_variant_maintain, transaction va05, system displays, blank screen, sales orders, solution implement, sd_variant_maintain
Related Notes : 
       
| 413511 | Authorizations for variant maintenance in ALV I | 
| 394914 | Display change documents from the document flow | 
| 300633 | General administration and setting information for ALV varia |