--- a/trytond/trytond/modules/stock/move.py
+++ b/trytond/trytond/modules/stock/move.py
@@ -949,6 +949,8 @@
         child_locations = {}
         to_write = []
         to_assign = []
+        to_copy = []
+        to_copy_values = {}
         success = True
         for move in moves:
             if move.state != 'draft':
@@ -1012,13 +1014,21 @@
                     to_assign.append(move)
                     first = False
                 else:
-                    with Transaction().set_context(_stock_move_split=True):
-                        to_assign.extend(cls.copy([move], default=values))
+                    to_copy.append(move)
+                    to_copy_values[move.id] = values
 
                 qty_default_uom = Uom.compute_qty(move.uom, qty,
                         move.product.default_uom, round=False)
 
                 pbl[key] = pbl.get(key, 0.0) - qty_default_uom
+        if to_copy:
+            with Transaction().set_context(_stock_move_split=True):
+                to_assign.extend(cls.copy(to_copy, default={
+                            'from_location': lambda d: (
+                                to_copy_values[d['id']]['from_location']),
+                            'quantity': lambda d: (
+                                to_copy_values[d['id']]['quantity']),
+                            }))
         if to_write:
             cls.write(*to_write)
         if to_assign: