Hi Joysaha,
That's not the right way to add fields to an entity as you are directly modifying the entitymodel.xml of an ofbiz's component.
Rather you need to define the entitymodel.xml in your custom component deployed in "hot-deploy" and extend the ProductPrice entity from the product model of ofbiz.
Sample:
<extend-entity entity-name="ProductPrice">
<field name="field1" type="very-short"></field>
<field name="field2" type="very-short"></field>
.
.
.
.
</extend-entity>
Refer this link for extending concept of ofbiz
https://cwiki.apache.org/OFBIZ/addressing-custom-requirements-in-ofbiz.html
RRH