AND-Mode criteria

A field cannot always be set to logical AND-mode. The reason for this is that the and alternative is logically
meaningful only if the concerned field is linked to only one other field. The following criteria must be fulfilled:
l the field must only exist in one logical table,
l the field must be the second column of no more than two columns,
l the table must not contain any duplicate records, and
l the field must be loaded with the distinct qualifier. If the table is loaded using a select statement, you
must use a preceding load distinct *.

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