Using an Action to delete the second ARTIST field

Hi,

I have some files with two ARTIST tags (i.e. when shown in MP3TAG, the ARTIST tag looks like "Artist1\\Artist2")

I'm trying to create an Action that takes the second ARTIST "Artist2", appends it to the TITLE field as "feat. Artist2" and then removes that second ARTIST field

The first part is done using the Format Function:
Field = TITLE
Format = %TITLE% feat. $meta(artist,1)

This works fine

What I'm trying to do now, is delete the second ARTIST tag completely, leaving me with:
ARTIST = Artist1
TITLE = Title feat. Artist2

I'm trying to delete the second ARTIST field using a Remove Fields Action:
Fields = $meta(artist,1)

But this isn't working

Any help would be really appreciated, thank you...

I think using Remove Duplicate fields: ARTIST

( I left "Only duplicate fields with same content" unchecked)

This seems to do the trick...