Configuration Package Field Filtering

I have an Excel Spreadsheet containing 3 Customer records. Two have a Currency Code of GBP and one has EUR. I'm trying to create a configuration package to only import the two that have a currency code of GBP and bypass the EUR one. So I went in to Edit - Config. Pagkage Filters and selected Field ID: 22 Field Name: Currency Code and I've tried various values in the Field Filter column:

... None of these work. All 3 records are being imported when I only want two. What am I doing wrong?

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