flectra/addons/l10n_in_gst/views/account_invoice_view.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>

    <!-- Inherit Customer Invoice Form View -->
    <record id="invoice_form_inherit_l10n_in_gst" model="ir.ui.view">
        <field name="name">account.invoice.form.inherit.gst.cust</field>
        <field name="model">account.invoice</field>
        <field name="inherit_id" ref="account.invoice_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='number']" position="after">
                <field name="gst_invoice" readonly="1"
                       class="oe_right"
                       attrs="{'invisible': [('state', 'not in', ('open', 'paid'))]}"
                       style="color: #7c7bad"/>
            </xpath>
            <xpath expr="//field[@name='fiscal_position_id']" position="replace"/>
            <xpath expr="//field[@name='date_invoice']" position="after">
                <field name="partner_location" invisible="1"/>
                <field name="fiscal_position_id"
                       options="{'no_create': True}"
                       attrs="{'required': [('partner_location', '=', 'inter_country')]}"/>
                <field name="gst_type" readonly="1"
                       attrs="{'invisible': [('state', 'not in', ('open', 'paid'))]}"/>
                <field name="vat" readonly="1"
                       attrs="{'invisible': [('state', 'not in', ('open', 'paid'))]}"/>
            </xpath>
            <xpath expr="//field[@name='partner_id']" position="after">
                <field name="e_commerce_partner_id"
                       attrs="{'readonly': [('state', 'not in', 'draft')]}"
                       domain="[('e_commerce', '=', True)]"/>
            </xpath>
            <xpath expr="//field[@name='tax_line_ids']" position="replace"/>
            <xpath expr="//group[@name='left_panel']" position="inside">
                    <field name="tax_line_ids" attrs="{'invisible': [('tax_line_ids', '=', [])]}" nolabel="1" colspan="4">
                        <tree editable="bottom" string="Taxes"
                              create="0">
                            <field name="name"/>
                            <field name="tax_id" invisible="1"/>
                            <field name="account_analytic_id"
                                   invisible="1"/>
                            <field name="sequence" invisible="1"/>
                            <field name="manual" invisible="1"/>
                            <field name="account_id"
                                   groups="account.group_account_user"/>
                            <field name="amount"/>
                            <field name="currency_id" invisible="1"/>
                        </tree>
                    </field>
            </xpath>
            <xpath expr="//page[@name='other_info']/group/group/field[@name='name']"
                    position="attributes">
                <attribute name="attrs">{'readonly': [('type', '=', 'out_refund')]}</attribute>
            </xpath>
        </field>
    </record>

    <!-- Inherit Supplier Invoice Form View -->
    <record id="invoice_supplier_form_inherit_l10n_in_gst" model="ir.ui.view">
        <field name="name">account.invoice.form.inherit.gst</field>
        <field name="model">account.invoice</field>
        <field name="inherit_id" ref="account.invoice_supplier_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='number']" position="after">
                <field name="gst_invoice" readonly="1"
                       class="oe_inline oe_right"
                       attrs="{'invisible': [('state', 'not in', ('open', 'paid'))]}"
                       style="color: #7c7bad"/>
            </xpath>
            <xpath expr="//field[@name='fiscal_position_id']" position="replace"/>
            <xpath expr="//field[@name='date_invoice']" position="after">
                <field name="partner_location" invisible="1"/>
                <field name="fiscal_position_id"
                       options="{'no_create': True}"
                       attrs="{'required': [('partner_location', '=', 'inter_country')]}"/>
                <field name="gst_type" readonly="1"
                       attrs="{'invisible': [('state', 'not in', ('open', 'paid'))]}"/>
                <field name="vat" readonly="1"
                       attrs="{'invisible': [('state', 'not in', ('open', 'paid'))]}"/>
            </xpath>
            <xpath expr="//field[@name='partner_id']" position="after">
                <field name="e_commerce_partner_id"
                       attrs="{'readonly': [('state', '!=', 'draft')]}"
                       domain="[('e_commerce', '=', True)]"/>
            </xpath>
            <xpath expr="//field[@name='tax_line_ids']" position="attributes">
                <attribute name="attrs">{'invisible': [('tax_line_ids', '=', [])]}</attribute>
            </xpath>
        </field>
    </record>

    <!-- Inherit Invoice Search View -->
    <record id="view_account_invoice_search_inherit_l10n_in_gst" model="ir.ui.view">
        <field name="name">account.invoice.search.inherit.gst</field>
        <field name="model">account.invoice</field>
        <field name="inherit_id" ref="account.view_account_invoice_filter"/>
        <field name="arch" type="xml">
            <group expand="0" position="inside">
                <filter string="GST Invoice"
                        context="{'group_by':'gst_invoice'}"/>
                <filter string="E-Commerce"
                        context="{'group_by':'e_commerce_partner_id'}"/>
            </group>
        </field>
    </record>

</flectra>