diff --git a/tailbone/views/purchasing/batch.py b/tailbone/views/purchasing/batch.py
index 8941de1c..746ae4d3 100644
--- a/tailbone/views/purchasing/batch.py
+++ b/tailbone/views/purchasing/batch.py
@@ -662,6 +662,9 @@ class PurchasingBatchView(BatchMasterView):
         f.set_type('invoice_unit_cost', 'currency')
         f.set_type('invoice_total', 'currency')
 
+        # upc
+        f.set_type('upc', 'gpc')
+
         if self.creating:
             f.remove_fields(
                 'upc',
diff --git a/tailbone/views/purchasing/receiving.py b/tailbone/views/purchasing/receiving.py
index 88acc16c..b61c53af 100644
--- a/tailbone/views/purchasing/receiving.py
+++ b/tailbone/views/purchasing/receiving.py
@@ -775,6 +775,9 @@ class ReceivingBatchView(PurchasingBatchView):
                 parent_rows = [row for row in batch.truck_dump_batch.active_rows()
                                if row.product_uuid == old_row.product_uuid]
 
+                # NOTE: "confirmed" are the proper amounts which exist in the
+                # parent batch.  "claimed" are the amounts claimed by this row.
+
                 # get existing "confirmed" and "claimed" amounts for all
                 # (possibly related) truck dump parent rows
                 confirmed = {}
@@ -882,7 +885,7 @@ class ReceivingBatchView(PurchasingBatchView):
                     # next we'd prefer to add to an existing claim, of any kind
                     elif row.truck_dump_claims:
                         claim = row.truck_dump_claims[0]
-                        setattr(claim, key, getattr(claim, key) + amount)
+                        setattr(claim, key, (getattr(claim, key) or 0) + amount)
 
                     else:
                         # otherwise we must create a new claim...