Error 'Context Value [expense type] is not in the list of values' when trying to validate an expense

Summary:

When validating certain expenses, the expense auditor is unable to validate, and gets the error 'Context Value [expense type] is not in the list of values'. It appears to be for expense types which have DFFs.

Content (required):

When validating certain expenses, the expense auditor is unable to validate, and gets the error 'Context Value [expense type] is not in the list of values'. It appears to be for expense types which have DFFs.

What does this error mean?

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

22A

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