diff -r 52798eba8ca0 trytond/trytond/modules/stock/move.py
--- a/trytond/trytond/modules/stock/move.py	Wed Nov 14 09:42:58 2018 +0100
+++ b/trytond/trytond/modules/stock/move.py	Wed Nov 14 09:44:58 2018 +0100
@@ -812,6 +812,8 @@
             else:
                 childs = [move.from_location]
             for location in childs:
+                if location.id == to_location.id:
+                    continue
                 key = get_key(move, location)
                 if key in pbl:
                     location_qties[location] = Uom.compute_qty(