Alvin,
There is a bug because of which some custom settings are not respected. This will be fixed in the next version of MyEclipse.
For now, can you use the specific settings on page 3 of the RE wizard? Drill down to your column in the tree and in the Hibernate Type field, enter the Type you want for that particular column.
Sorry for the inconvenince caused, let us know if you require further assistance,
Brian.