Ease debugging

git-svn-id: https://svn.erp5.org/repos/public/erp5/sandbox/amount_generator@39393 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessProcess.py

@@ -692,7 +692,9 @@ class BusinessProcess(Path, XMLObject):
     if not trade_phase:
       trade_phase = amount.getTradePhase()
       if not trade_phase:
-        raise ValueError("A trade_phase must be defined on the Amount or provided to getTradePhaseMovementList")
+        raise ValueError("%s: a trade_phase must be defined on the " \
+                         "Amount or provided to getTradePhaseMovementList" %
+                          amount.getRelativeUrl())
 
     # Build a list of temp movements
     from Products.ERP5Type.Document import newTempMovement