Solution : https://service.sap.com/sap/support/notes/492167 (SAP Service marketplace login required)
Key words :
user group '/sapquery/um' select query 'mevl31', select function edit -> cancel change lock, select function edit -> change user group, choose user group '/sapquery/um', select function environment -> work areas, select function goto -> query directory, user group '/sapquery/um', select function query -> change, set indicator 'change lock', select entry '/sapquery/mevl 31'
Related Notes :
| 495974 | VL31N: Missing views |