15. VIFRED Field Specifications : Required and Other Attributes : Nullable Data Types
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Nullable Data Types
You can specify that a data type is nullable or non‑nullable by entering y for nullable or n for non‑nullable in the Nullable field. A nullable data type accepts a null value.
If the form field for which you are specifying attributes is to be linked to a data column in a table, the null specification on the Attributes for Field frame must match the null specification of the data column in the table.