How can I unselect the client from "generate bill"- "selection filters" -"client selection"

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I'm trying to unselect client from "selection filters" any ideas how to do it? When I'm unselecting her it gives me the error message and says "client selection doesn't exclude any records. It will be automatically removed from the selected filters unless you edit it. Do you want to edit the filter again?" I'm trying to edit it but it gives me the error message again. Any ideas how to fix it?

Many thanks in advance

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