[FIX] purchase: maximum recursion when write on minimum_planned_date

Do not write on the function field when you are writing on the function field.

- Now you do know what orders is right?
- I think I know...
- Orders is orders.
- I guess no one ever taught you not to use the word you're defining in the definition.
   ~~Lucky Number Slevin

addons/purchase/purchase.py

@@ -65,7 +65,6 @@ class purchase_order(osv.osv):
                     ('order_id', '=', po.id), '|', ('date_planned', '=', po.minimum_planned_date), ('date_planned', '<', value)
                 ], context=context)
                 pol_obj.write(cr, uid, pol_ids, {'date_planned': value}, context=context)
-                self.pool.get('purchase.order').write(cr, uid, po.id, {'minimum_planned_date': value}, context=context)
         self.invalidate_cache(cr, uid, context=context)
         return True
 

addons/purchase/test/process/edi_purchase_order.yml

@@ -5,6 +5,7 @@
     partner_id: base.res_partner_3
     location_id: stock.stock_location_3
     pricelist_id: 1
+    minimum_planned_date: '2011-08-31'
     order_line:
       - product_id: product.product_product_33
         product_qty: 10.0