Set True to generate callback method support in the Multirow class that Handles this FieldMap.

 

A callback method is a special Delegate definition that is optional in the generation of a listclass.  It is optional since in some cases it can introduce additional complexity in understanding a class.

 

The callback provides access to a row as it is read from the screen which can work "to the side" from any loops built to process the list.  For example, list row data can be altered in a callback routine in separate logic than that processing the data.