why loops are seem redundant on solidworks mold tools?

Hi all, I am beginner on solidworks mold tools. I have to be make a mold of basic electronic box. It was not difficult to make mold of cap of box, but when i tried to make base part of box i faced one problem that it says "loops are redundant". In base, there lots of holes. To activate tooling split i should use shut-off surfaces for covering holes, but when i did it, there is warning: "Loops are redundant". Can anyone tell me how can i fix it?

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