View File

<?xml version="1.0" encoding="UTF-8"?>
    <openerp>
    <data>
    <!-- tree view -->
    <record id="test_tree_view" model="ir.ui.view">
                <field name="name">test.tree</field>
                <field name="model">test.rel</field>
                <field name="type">tree</field>
                <field eval="7" name="priority"/>
                <field name="arch" type="xml">
                    <tree string="TEST">
                        <field name="name"/>
                    </tree>
                </field>
    </record>
    <!--form view-->

    <record id="test_form_view" model="ir.ui.view">
                <field name="name">test.form</field>
                <field name="model">test.rel</field>
                <field name="type">form</field>
                <field eval="7" name="priority"/>
                <field name="arch" type="xml">
                    <form string="TEST">

                        <group colspan="2" col="3">
                        <field name="name"/>
                        </group>

                    <notebook colspan="6">
                        <page string="Tests">

        <field colspan="4" name="test_lines" nolabel="1" widget="one2many_list">
                                <tree editable="top" colors="red:test in ()">
                                    <field name="test"/>
                                    <field name="comment"/>
                                </tree>

                                    <form string="Tests ">
                                       <field name="test"/>
                                       <field name="comment"/>
                                   </form>
    </field>
                        </page>

    </notebook>

                    </form>
                </field>
    </record>

    <record id="test_action" model="ir.actions.act_window">
                <field name="name">test</field>
                <field name="type">ir.actions.act_window</field>
                <field name="res_model">test.rel</field>
                <field name="view_type">form</field>
                <field name="view_mode">tree,form</field>
                <field name="view_id" ref="test_tree_view"/>
     </record>
    <menuitem id="menu_test_3" parent="menu_section_test" name="Test 3" action="test_action" />

    </data>
    </openerp>

PY file

class test_rel(osv.osv):
    _name = 'test.rel'
    _columns = {
        'name': fields.char('Reference', size=50),
        'test_lines': fields.one2many('test.lines', 'test_id', 'test Lines'),
    }
#test_rel()

class test(osv.osv):
    _name = 'test.lines'
    _columns = {
        'test_id': fields.many2one('test.rel', 'Parent test', ondelete='cascade',select=True),
        'test': fields.char('Test', size=40),
        'comment': fields.text('Commentaire',size=400),
    }
#test()

Why selection is not coming when selecting an item in one 2many filed It should list all the availiable records

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