Subject Area filtering - empty values

Summary: Subject Area filtering - empty values

Content (required): Subject Area filtering of Assignment Type filters out empty values as well. For example, if we have pending workers, employees, contingent workers, and an empty value for specific position id's, filtering out contingent workers results in the report filtering out the empty value row entries as well. What is the cause of this and how can this be avoided?

Version (include the version you are using, if applicable): 21c

Code Snippet (add any code snippets that support your topic, if applicable):

sample analysis

xml attached