diff -r f8b0365a4027 trytond/trytond/modules/stock/move.py
--- a/trytond/trytond/modules/stock/move.py	Wed Nov 14 09:47:57 2018 +0100
+++ b/trytond/trytond/modules/stock/move.py	Wed Nov 14 09:48:32 2018 +0100
@@ -845,6 +845,8 @@
             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(