suite/product_catch_weight/views/account_invoice_views.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record id="invoice_form_inherit" model="ir.ui.view">
        <field name="name">account.invoice.form.inherit</field>
        <field name="model">account.invoice</field>
        <field name="inherit_id" ref="account.invoice_form"/>
        <field name="arch" type="xml">
            <xpath expr="//tree/field[@name='price_unit']" position="after">
                <field name="catch_weight" attrs="{'invisible': [('catch_weight_uom_id', '=', False)]}"/>
                <field name="catch_weight_uom_id" readonly="1" attrs="{'invisible': [('catch_weight_uom_id', '=', False)]}"/>
            </xpath>
        </field>
    </record>
    <record id="invoice_supplier_form_inherit" model="ir.ui.view">
        <field name="name">account.invoice.supplier.form.inherit</field>
        <field name="model">account.invoice</field>
        <field name="inherit_id" ref="account.invoice_supplier_form"/>
        <field name="arch" type="xml">
            <xpath expr="//tree/field[@name='price_unit']" position="after">
                <field name="catch_weight" attrs="{'invisible': [('catch_weight_uom_id', '=', False)]}"/>
                <field name="catch_weight_uom_id" readonly="1" attrs="{'invisible': [('catch_weight_uom_id', '=', False)]}"/>
            </xpath>
        </field>
    </record>


    <template id="report_invoice_document_inherit" name="report_invoice_document_catch_weight" inherit_id="account.report_invoice_document">
        <xpath expr="//table[@name='invoice_line_table']/thead/tr/th[4]" position="after">
            <t t-if="o.invoice_line_ids.filtered(lambda l: l.catch_weight_uom_id)">
                <th class="text-right">Catch Weight</th>
                <th class="text-right">CW Unit Price</th>
            </t>
        </xpath>
        <xpath expr="//tbody[hasclass('invoice_tbody')]/t[2]/tr/t/td[4]" position="after">
            <t t-if="o.invoice_line_ids.filtered(lambda line: line.catch_weight_uom_id)">
                <t t-if="line.catch_weight_uom_id">
                    <td class="text-right">
                        <strong t-field="line.catch_weight"/>
                        <span t-field="line.catch_weight_uom_id"/>
                        <hr style="padding: 0; margin: 0;"/>
                        <t t-if="o.type in ('out_invoice', 'out_refund')" t-set="lots" t-value="line.sale_line_ids.mapped('move_ids.move_line_ids.lot_id')"/>
                        <t t-else="" t-set="lots" t-value="line.purchase_line_id.mapped('move_ids.move_line_ids.lot_id')"/>
                        <ul class="list-unstyled">
                            <li t-foreach="lots" t-as="lot">
                                <span t-field="lot.name"/>: <span t-field="lot.catch_weight"/>
                            </li>
                        </ul>
                    </td>
                    <td class="text-right">
                        <span t-esc="'{:0.2f}'.format(line.uom_id._compute_price(line.price_unit, line.catch_weight_uom_id))"/>
                         /
                        <span t-field="line.catch_weight_uom_id"/>
                    </td>
                </t>
                <t t-else="">
                    <td/>
                    <td/>
                </t>
            </t>
        </xpath>
        <xpath expr="//tbody[hasclass('invoice_tbody')]/t[2]/t[3]/tr/td" position="after">
            <t t-if="o.invoice_line_ids.filtered(lambda line: line.catch_weight_uom_id)">
                <td/>
                <td/>
            </t>
        </xpath>
    </template>
</odoo>