Not compatible with "CCK Time" module

I both installed this module and "CCK time" module to control time fields(defined by cck time). When triggered, a time field will be displayed in the form. Howerver, after submitting the form, system always show me that "this field is required", even I have filled answer in the time field. Does it mean this module is not compatible with "CCK Time" module? How should I fix it?