New field on publication output not appearing in publicationoutput.met

Hi,

I have successfully configured a new dropdown field in my publication output window (following https://community.rws.com/product-groups/tridion/tridion-docs/f/forum/40470/how-to-add-a-new-field-to-output-properties-popup-in-publication-manager)

However, when I publish the publication output after selecting a value from the field I don't see the new field or the selected value in the generated publicationoutpu.met file. 

Can anyone advise what step I might be missing?

Thanks in advance,

Ann

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