You cannot revoke permissions, only grant them. Therefor, click on the All Objects button and uncheck those you want to revoke there and see how NAV handles this.
I strongly advice against using this technique thou. It might not cause too much trouble on system objects, but on all other types always grant access to whatever the role needs and resist the urge to think along the line "everything but ..."
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I strongly advice against using this technique thou. It might not cause too much trouble on system objects, but on all other types always grant access to whatever the role needs and resist the urge to think along the line "everything but ..."