cooperative-market/beesdoo_inventory/views/stock.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record model="ir.ui.view" id="beesdoo_stock_tree_view">
        <field name="name">beesdoo.stock.tree.view</field>
        <field name="model">stock.picking</field>
        <field name="inherit_id" ref="stock.vpicktree" />
        <field name="arch" type="xml">
            <field name="partner_id" position="after">
                <field name="responsible" />
            </field>
        </field>
    </record>

    <record model="ir.ui.view" id="beesdoo_stock_form_view">
        <field name="name">beesdoo.stock.form.view</field>
        <field name="model">stock.picking</field>
        <field name="inherit_id" ref="stock.view_picking_form" />
        <field name="arch" type="xml">
            <field name="scheduled_date" position="after">
                <field name="max_shipping_date" placeholder="Max shipping date" />
            </field>
            <field name="backorder_id" position="after">
                <field name="responsible" />
            </field>
            <button name="action_assign" position="after">
                 <button name="copy_qty" string="Copy Pack Quantity" states="partially_available,assigned" type="object" class="oe_highlight"
                         attrs="{'invisible': ['|', ('picking_type_code', '!=', 'incoming')]}"/>
            </button>
            <xpath expr="//field[@name='product_id']" position="attributes">
                <attribute name="domain">[('main_seller_id', '=', parent.partner_id)]</attribute>
            </xpath>
        </field>
    </record>
</odoo>