Out of the box, users with the sn_hr_le.case_writer role are unable to do inline list editing for cases in the HR Lifecycle Events Case sn_hr_le_case table. They get the message “Security prevents writing to this field”. On the other hand, they can do list editing for any other case extended from the HR Case table (sn_hr_core_case). This is because of a rogue ACL:
/now/nav/ui/classic/params/target/sys_security_acl.do%3Fsys_id%3D9688097a537433008a4eddeeff7b1216
You’ll notice that this ACL is for the sn_hr_le_case table, however it is in the Human Resources: Core scope. Because of this (I think), it ends up having the opposite effect and preventing list editing. To fix this, simply disable the rule. Users will then be able to do list editing of sn_hr_le_case from the sn_hr_core_case table (list of all HR cases)
If you want users to be able to list edit directly on sn_hr_le_case, create a new ACL as below