Language Reference Guide > Language Reference Guide > System Classes > FieldObject Class > IsNullable Attribute
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IsNullable Attribute
Data Type: smallint
4GL Access: RW1
The IsNullable attribute specifies whether the variable can be set to null.
The attribute is TRUE if the variable can be null and FALSE if it cannot be null. If the data type of the field is a class, this attribute is always set to TRUE.
Last modified date: 12/20/2023