Copy ARTIST to ALBUMARTIST only if empty

Hi, I want to copy the ARTIST value into ALBUMARTIST only if ALBUMARTIST is empty or doesn't exist. I don't want MP3Tag to replace the ALBUMARTIST tag if there is any info already in there. How can I do that?

Thanks.

see this thread:

the shortest way would probably be:
Action "Format value" Field: ALBUMARTIST Formatstring: $if2(%ALBUMARTIST%,%ARTIST%)

Thank you both (?). That solved my problem, I just tested it with a bunch of files.

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I have this bookmarked

Thank you, will look into that.