Hi,

I tried remove the button "create" for a specify group and for specify state.

For all users and for all states I tried with something like this and works:

<record id="view_picking_out_tree_change" model="ir.ui.view">
            <field name="name">stock.picking.out.tree.change</field>
            <field name="model">stock.picking.out</field>
            <field name="inherit_id" ref="stock.view_picking_out_tree"/>
            <field name="arch" type="xml">
                <xpath expr='//tree[@string="Delivery Orders"]' position='attributes'>
            <attribute name="create">false</attribute>    
        </xpath>
            </field>
</record>

Is possible do this depending of group and state?

After this I tried:

<record id="view_picking_out_tree_change" model="ir.ui.view">
            <field name="name">stock.picking.out.tree.change</field>
            <field name="model">stock.picking.out</field>
        <field name="inherit_id" ref="stock.view_picking_out_tree"/>
        <field name="groups_id" eval="[(6, 0, [ref('gestao_ideias.group_gestao_ideias_manager')])]"/>
            <field name="arch" type="xml">
                <xpath expr='//tree[@string="Delivery Orders"]' position='attributes'>
            <attribute name="create">false</attribute>
        </xpath>
            </field>
 </record>

I have two groups:

gestao_ideias.group_gestao_ideias_system_manager

acess_gestao_ideias9,gestao.ideias,model_gestao_ideias,group_gestao_ideias_system_manager,1,1,1,1

gestao_ideias.group_gestao_ideias_manager

acess_gestao_ideias10,gestao.ideias,model_gestao_ideias,group_gestao_ideias_manager,1,1,1,0

This solution also doesn't work. But if I change field name="groups_id" for this:

<field name="groups_id" eval="[(6, 0, [ref('gestao_ideias.group_gestao_ideias_system_manager')])]"/>

Works! Why? In this case the user with more permissions don't have a button create but other user have.

Thanks.