How to avoid invalid data entering in LOV through code

hi
1)i have developed lov in table region, but user easily can enter invalid data and saved into the database tables.
2)i created one formvalue and mapping into that return item , still its not working in table region LOV.
3)how to avoid invalid data entering in LOV through code. i have tried this below code in EOimpl set value method. but some how its not wokring.
if (value!=null)
throw new OAAttrValException(OAAttrValException.TYP_ENTITY_OBJECT,
getEntityDef().getFullName(),
getPrimaryKey(),
"ProcurementCategory",
getProcurementCategory(),
"FND",
"FND_LOV_SELECT_VALUE");
Thanks.
krish.

Thanks reetesh and gourav for your help.
i followed below mapping details
LOV Item Properties
ID -PurcCommodity
ViewInstance -VendorVO1
ViewObject -PurcCommodity
map1 properties
LOV Region Item - segment1
Return Item -PurcCommodity
CriteriaItem -PurcCommodity
Usefor Validation -Default
map2 properties
LOV Region Item - segment1
Return Item -validation(formvalue)
CriteriaItem -
Usefor Validation -yes
form value properties
ID -validation
ViewInstance -VendorVO1
ViewObject -PurcCommodity
Gourav- i double checked multiple rows it is not working, some times it is not working for single row too.
Thanks
krish.

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