I know this is a dumb question before asking but first day migrating over to 2.0 and it's had me stumped too long!

var itemRecord = r.load({ type: r.Type.itemType, id: itemid, isDynamic: true  });

itemType value is "ASSEMBLY_ITEM" and itemid is a valid assembly item id. The error is "missing a required arguement type". Please put me out of my misery!

Remove the

r.Type

Hmm, did try that at points, but gave me an invalid record type of "ASSEMBLY_ITEM"

It's

r.Type.ASSEMBLY_ITEM

if you're not setting that elsewhere

Alright, must be an issue with me holding the end section in a variable then

itemType

should be

assemblyitem

ah, Guess I was using a bad source list for my switch! that has sorted it. cheers