Language Reference Guide > Language Reference Guide > System Classes > CompSource Class > IsNullable Attribute
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IsNullable Attribute
Data Type: smallint
4GL Access: RW1
The IsNullable attribute is applicable only to frame and procedure components. It is TRUE if the return variable for the component can be set to null.
If the value of DataType attribute is a class name, IsNullable is always TRUE.
Last modified date: 12/20/2023