[FIX] Point_Of_Sale : Discount was not linked to the invoice made from returned picking of POS.

lp bug: https://launchpad.net/bugs/501386 fixed

bzr revid: jvo@tinyerp.com-20100111113046-qg0igbrerhnin815

addons/point_of_sale/pos.py

@@ -361,6 +361,7 @@ class pos_order(osv.osv):
                         'product_uos_qty': abs(line.qty),
                         'product_qty': abs(line.qty),
                         'tracking_id': False,
+                        'pos_line_id': line.id,
                         'state': 'waiting',
                         'location_id': location_id,
                         'location_dest_id': stock_dest_id,

addons/point_of_sale/stock.py

@@ -23,6 +23,17 @@ from osv import osv, fields
 import time
 import netsvc
 
+class stock_move(osv.osv):
+    _inherit = 'stock.move'
+    
+    _columns = {
+        'pos_line_id': fields.many2one('pos.order.line',
+            'Pos Order Line', ondelete='set null', select=True,
+            readonly=True),
+    }
+    
+stock_move()
+
 
 class stock_picking(osv.osv):
 
@@ -30,6 +41,12 @@ class stock_picking(osv.osv):
     _columns = {
         'pos_order': fields.many2one('pos.order', 'Pos order'),
     }
+    
+    def _get_discount_invoice(self, cursor, user, move_line):
+        if move_line.pos_line_id:
+           return move_line.pos_line_id.discount
+        return super(stock_picking, self)._get_discount_invoice(cursor, user,
+               move_line)
 
 stock_picking()