Update a multi-select field via function

Update a multi-select field via function

Hey,

I'm trying to have a value selected in a multiselect lookup field via a function - I'm stuck on getting the 'fetched record' updated because
The Left expression is of type STRINGLIST and the right expression is of type STRING and the operator == is not valid here
Anyone have any idea how to get around this? The help documentation and other forum posts related to this error message are pretty opaque. FYI - All of the values available in the first form's dropdown field are the same as the mulitselect field in the second form (fetched record).

Thanks