diff --git a/move.py b/move.py
index 57b239bbf5..c50d598cc2 100644
--- a/move.py
+++ b/move.py
@@ -20,7 +20,8 @@ class Move(OSV):
             domain=[('type', '!=', 'service')])
     uom = fields.Many2One("product.uom", "Uom", required=True, states=STATES,
             domain="[('category', '=', " \
-                    "(product, 'product.default_uom.category'))]")
+                    "(product, 'product.default_uom.category'))]",
+            context="{'category': (product, 'product.default_uom.category')}")
     unit_digits = fields.Function('get_unit_digits', type='integer',
             string='Unit Digits', on_change_with=['uom'])
     quantity = fields.Float("Quantity", required=True,