If any UDF or flag fields are enabled, enable the Override Shift Configuration
check box by configuring this field as a CheckboxUI control.
The Override
Shift Configuration check box controls if an ad-hoc shift is
created using the default UDF and flag values from shift configuration or using
the user specified values. When this check box is enabled, the created ad-hoc
shift includes the values specified by the user in the UDF and flag fields. When
this check box is disabled, the created ad-hoc shift includes the default UDF
and flag values from shift configuration.