Administration Screen Override Rules
The rules for an override are that any Administration screen setting – whether a single-line setting or multi-line setting – specified at the lower levels also overrides that same setting name at higher levels.
So, the settings at the application level apply unless specific settings are overridden for a particular component or a particular user. When an override happens, it occurs for the complete setting name. This means that if a specific multi-line setting has three rows at the user level and 12 rows at the application level, then the resulting multi-line setting value for that setting contains only the three rows at the user level. An override mechanism also allows a setting to be removed, rather than replaced.