Using "In" in a when condition

Question

OK, So I want to identify a value in MSA 1 is in a list of Strings. I have

HL7.{MSA:1} In ("AE", "AR", "CE", "CR")

That doesn't work, so what should it be?

Answer 1

Figured this out. it's

HL7.{MSA:1} In ("AE,AR,CE,CR")