It can be done easily using "Boolean validator with math, date-time or text-string terms" of JIRA Workflow Toolbox plugin.
You should use a boolean expression like:
%{nnnnn} = "Required_Value_For_Select_List" IMPLIES (%{mmmm.0} != null AND %{mmmm.1} != null)
where:
That boolean expression requires that both levels (0 and 1) of Cascading Select field are set when Select List custom field is "Required_Value_For_Select_List".
If you want a more detailed explanation, please give me more details of your particular use case.
Best regards,
Fidel
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