The built-in Fields value refers to a column from your datasource i.e. it is expected to return a value for each record from your datasource. The DocumentName on the other hand expects a String
that would be used as the name for the exported report and this is evaluated on report document level (Report, ReportBook). In short you cannot use datasource fields in it and that is why you do not see the fields in the Expression Editor for DocumentName property.
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