concat and cast problem

Hi All,

I have this cast function

cast(
'type!{urn:com:appian:types:TLT}TLT_VEHICLEDETAIL?list',
  ri!data
  )

and I'd like to change TLT_VEHICLEDETAIL with a dynamic input using ri!inType.

I thought to fix this problem with concat function ex.  but it doesn't work.

and my result was this one   

who can help me?