Solution : https://service.sap.com/sap/support/notes/1597415 (SAP Service marketplace login required)
Key words :
terms rule set page, rule set table, ctrl+shift+f10, menu 'table entry', symptom blank entry, blank line entry, blank entry, blank line, 'gracruleset' table, nwbc reason
Related Notes :
| 1575085 | Locking issues for Function, Risk, Ruleset and RAR objects |