Field value of which it is mandatory to obtain on the client.
Indicates whether field selection is mandatory.
True - the field is mandatory.
False - the field is optional.
If the flag for required selection of this column is not set and the column is invisible (e.g. a hidden column in a table), the data for this column will not be selected.
If you plan to access the data programmatically, you have to set up the mandatory selection flag for this column.