| Reference ModeIf a table field is defined with a reference, the table field can have one of the following
reference modes. Mandatory The table field must contain a value that is present in the reference table. Mandatory unless empty The table field can be empty. If the table field is filled, its
value must be present in the reference table. Non Mandatory The table field can contain a value that is present in the
reference table, but the table field can also contain an other value.
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