Requirement is to update parent record multi-select picklist value, if a user updates child record multi-select picklist values. Parent field should only be updated if the child record has a value.
I created a process builder to achieve the goal but receiving the following error:
The formula expression is invalid: Field Version is a multi-select picklist field. Multi-select picklist fields are only supported in certain functions.
Snapshot of what I am doing in the process builder is given below
Salesforce documentation specifies that one could use multi-select picklists in certain formulas but I don't understand why am I receiving this error then.