i Activate Dropshipping its working well 

when i create sale order auto purchase order is generated 

Case is 

i have custom field in Purchase.order.line field name is sh_sec_uom its not automatically filled 

other then if i go purchase order and put product_id then its automatically filled .....

code is here 

```

class sh_purchase_order_line(models.Model): 

 _inherit = "purchase.order.line"

@api.multi @api.onchange('product_id', 'product_uom') 

 def onchange_secondary_uom(self): 

 if self: for rec in self: 

 if rec.product_id.sh_is_secondary_unit == True and rec.product_id.uom_id: 

 rec.sh_sec_uom = rec.product_id.sh_secondary_uom.id

```

this code is working file when i crate purchase order line 

its not working when i create sale order and auto purchase order is created in dropshipping 

where i can customized to full fill my requirements