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.