Check your Beans and your Dozer-Mapping-File.
There are multiple (more or less common) errors possible:
Typo in the mappingfile. Check the package and field names in your POLocationEntity, does it have a field named tarShipMethodCode, and does this have an ImCourier field, and this a courierName field?
Lack of getters / setters. Again check the beans, Dozer usually expects getFieldName and setFieldName methods, unless you specified others (which I do not assume, maybe post your mapping file).
Narrow the problem down: Is this the only field that is not working? Or is this field not specified at all? Dozer tends to try to map-by-name fields that do not have corresponding entries in the mapping file, which could lead to unexpected errors.
tl;dr
With some more information (mapping xml, bean code) this would be easier to analize, but the above pointers are the ones that solve these kinds of problems in my experience.