Solution : https://service.sap.com/sap/support/notes/356018 (SAP Service marketplace login required)
Key words :
20b support package 18 / 21c support package 10, update rsadmins set tadirpopup = 'x', edit -> transport -> activate standard, set field tadirpopup, browser- based applications, browser-based applications, sap original system, object directory entries, standard transport system, system -> user profile ->
Related Notes :
| 337950 | Queries (and other objects) cannot be edited |