As far as i know garments aren't affected by lua files unless your showing them as sprites - custom robe system.
Assuming you skipped the scripts while pasting. the second field shouldn't have any spaces.
Try 29991, Blue_Black_Valkyrie_Manteau,Blue Black Valkyrie Manteau,5,0,,500,,10,,1,0xFFFFFFFE,2,2,4,,1,1,0,
Also name the item, collection, drop sprites as Blue_Black_Valkyrie_Manteau.*
(if u plan to use bbvm.* then change the second field to bbvm as well).