diff --git a/tailbone/views/purchasing/batch.py b/tailbone/views/purchasing/batch.py
index 117598b5..d1bcd144 100644
--- a/tailbone/views/purchasing/batch.py
+++ b/tailbone/views/purchasing/batch.py
@@ -232,10 +232,13 @@ class PurchasingBatchView(BatchMasterView):
 
         # po_total
         if self.creating:
-            f.remove_field('po_total')
+            f.remove_fields('po_total',
+                            'po_total_calculated')
         else:
             f.set_readonly('po_total')
             f.set_type('po_total', 'currency')
+            f.set_readonly('po_total_calculated')
+            f.set_type('po_total_calculated', 'currency')
 
     def configure_form(self, f):
         super(PurchasingBatchView, self).configure_form(f)
@@ -618,6 +621,7 @@ class PurchasingBatchView(BatchMasterView):
         g.set_type('cases_received', 'quantity')
         g.set_type('units_received', 'quantity')
         g.set_type('po_total', 'currency')
+        g.set_type('po_total_calculated', 'currency')
         g.set_type('credits', 'boolean')
 
         # we only want the grid column to have abbreviated label, but *not* the filter
@@ -690,6 +694,7 @@ class PurchasingBatchView(BatchMasterView):
         # currency fields
         f.set_type('po_unit_cost', 'currency')
         f.set_type('po_total', 'currency')
+        f.set_type('po_total_calculated', 'currency')
         f.set_type('invoice_unit_cost', 'currency')
 
         # upc
@@ -794,8 +799,10 @@ class PurchasingBatchView(BatchMasterView):
         # currency fields
         f.set_type('po_unit_cost', 'currency')
         f.set_type('po_total', 'currency')
+        f.set_type('po_total_calculated', 'currency')
         f.set_type('invoice_unit_cost', 'currency')
         f.set_type('invoice_total', 'currency')
+        f.set_type('invoice_total_calculated', 'currency')
 
         # if self.creating:
         #     f.remove_fields(
@@ -911,7 +918,7 @@ class PurchasingBatchView(BatchMasterView):
         # now apply new totals based on current row quantity
         if batch.mode == self.enum.PURCHASE_BATCH_MODE_ORDERING and row.po_unit_cost is not None:
             row.po_total_calculated = row.po_unit_cost * self.handler.get_units_ordered(row)
-            batch.po_total_calculated += row.po_total_calculated
+            batch.po_total_calculated = (batch.po_total_calculated or 0) + row.po_total_calculated
 
         return row