Update a Data Extension with a Null Field Value
This page contains information on how to use the SOAP API to update a nullable field in a data extension to a null value.
Why Update a Data Extension Object with a Null Field Value
After assigning a value to a nullable field within a data extension, it may be necessary to return that field to a null value. When a call does not provide a value for a field in an update request, that field retains the current value. In order to overwrite the value of a field with a null value, the call must explicitly state that null value using the NullAPIProperty type.
Use the sample code to update a nullable field in a data extension to a null value.