pos/pos_to_weight_by_product_uom/demo/product_uom_demo.xml

<!-- Copyright 2017, Grap
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->

<openerp><data>

        <record model="product.uom" id="product_uom_to_weigh">
            <field name="name">Demo - New Uom To Weigh</field>
            <field name="category_id" ref="pos_to_weight_by_product_uom.product_uom_categ_to_weigh"/>
        </record>

</data></openerp>