An Agency receives royalties on behalf of artists it represents. Should the 1099's to the artists list the full royalty received or the royalty minus commissions?

"Agency A receives $1000 royalty for work by represented Artist B. It takes a $400 commission, and pays Artist B $600. Agency A reports the royalties on Form 1099-Misc and sends it to Artist B. Should the royalties reported by $1000 or $600?"