I am trying to keep validation for boolean field. In this field only one field in the table can true, if one field gets checked true (checked for default stage) then remaining fields should get false.

xml:

<record id="in_stage_field_Form_view" model="ir.ui.view">

         <field name="name">Stage</field>

         <field name="model">inventory.stages</field>

          <field name="view_type">form</field>

         <field name="view_mode">form</field>

         <field name="arch" type="xml">

           <form >

               <sheet>

                   <group>

                       <field name="name" required="True"/>

                       <field name="default_stage" />

                   </group>

               </sheet>

           </form>

         </field>

       </record>

py:

class inventory_stages(models.Model):

    _name = "inventory.stages"

    name = fields.Char ()

    default_stage = fields.Boolean ("Default Stage")

Here i want to keep validation for default_Stage field.