Property Calculator – How to get the difference between two Multi-Select Lookup lists

Hello,

I would like to know if it is possible with Property Calculator to create a property C containing the difference between two multi-select lookup properties:

  • A = first list
  • B = second list
  • C = values present in A but not in B

So basically:

C = A - B



Here "Liste A - B" should contain bb bbb.

I tried using different modes such as:

  • Filter Lookup Values
  • Advanced Conditions
  • Comparing to Main Object

but without success so far.

Is there a supported way to achieve this with Property Calculator, or another recommended approach?

Thank you very much in advance for any advice or suggestions.