Good catch.

Hi how can I make this so that the variable Im getting the value from is a list collector and can have multiple values. Ive tried: javascript: 'parentIN=' + current.variables.u_requested_by_lob_v2 but it says "no matches found".

It works when there is only 1 entry with this: javascript: 'parent=' + current.variables.u_requested_by_lob_v2 

What type of field are you putting the reference qualifier on?

a list collector 

The operator should just be IN not IN=:

javascript: 'parentIN' + current.variables.u_requested_by_lob_v2;