Field AN

“Allow nulls” status of a form field. Indicates the value to be taken by the form field when it contains no data.

A 1-character code, as shown in the table below:

CODE	MEANING
Y	When no data is entered, the field is $Null (valueless)
N	When no data is entered, the field takes the value zero (0) if its data type (DT) is numeric or date, or the null string (“”) if its data type is alphanumeric

When AN is set to N, the end-user can set a toggle button to the null state.