You can only edit Custom rules. If the Rule Type is System, it opens in read-only mode.
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On the Tools menu, click Knowledge, and then click MPE Rule Builder.
The Rule Builder window appears. -
On the main toolbar, click the folder icon.
The Rule Browser window opens. -
In the left pane, select a Log Message Source Type.
The rules associated with your selection appear in the right pane. -
In the right pane, double-click the rule you want. You return to the Rule Builder window which is now populated with information from the selected rule.
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Make the edits you want.