We have a link to a foreign key which works well in 7 but not in 8. In version 7 you can set a parameter to empty which causes this field not to be used in the sql statement. In version 8 it will cause the unused field added to the query, but with an empty value causing no records to be found. Call it a feature, I call this a bug. If this feature has been added to 8 then add another option like 'unused' so that we can suppress these fields to appear in the sql statement.
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