<?xml version="1.0"?>
<openerp>
    <data>

        <record id="task_type_edit_state" model="ir.ui.view">
            <field name="name">task_type_edit_state</field>
            <field name="model">project.task.type</field>
            <field name="inherit_id" ref="project.task_type_edit"/>
            <field name="arch" type="xml">
                <field name="fold" position="after">
                    <field name="state" />
                </field>
            </field>
        </record>

    </data>
</openerp>

<?xml version="1.0"?>
<openerp>
    <data>

        <record id="task_type_edit_state" model="ir.ui.view">
            <field name="name">task_type_edit_state</field>
            <field name="model">project.task.type</field>
            <field name="inherit_id" ref="project.task_type_edit"/>
            <field name="arch" type="xml">
                <field name="fold" position="after">
                    <field name="state" />
                </field>
            </field>
        </record>

        <!-- Project Task form -->
        <record id="project_task_form_stage" model="ir.ui.view">
            <field name="name">project_task_form_stage</field>
            <field name="model">project.task</field>
            <field name="inherit_id" ref="project.view_task_form2"/>
            <field name="arch" type="xml">

                <field name="partner_id" position="after">
                    <field name="state" />
                </field>

            </field>
        </record>

    </data>
</openerp>

Add state field to Task form
Add state field to Task form
