The VALUEUNCHECKED attribute defines the value associated with a checkbox item when it is not checked.
VALUEUNCHECKED = value
This attribute is used in conjunction with the VALUECHECKED attribute to define the values corresponding to the states of a CHECKBOX.
This attribute is not used by the runtime system to validate the field, you must use the INCLUDE attribute to control value boundaries.
CHECKBOX cb01 = FORMONLY.checkbox01, TEXT="OK", VALUECHECKED="Y", VALUEUNCHECKED="N";