diff --git a/tailbone/views/purchasing/batch.py b/tailbone/views/purchasing/batch.py
index 39106e13..117598b5 100644
--- a/tailbone/views/purchasing/batch.py
+++ b/tailbone/views/purchasing/batch.py
@@ -896,14 +896,23 @@ class PurchasingBatchView(BatchMasterView):
         batch = row.batch
 
         # first undo any totals previously in effect for the row
-        if batch.mode == self.enum.PURCHASE_BATCH_MODE_ORDERING and row.po_total:
-            batch.po_total -= row.po_total
+        if batch.mode == self.enum.PURCHASE_BATCH_MODE_ORDERING and row.po_total_calculated:
+            batch.po_total_calculated -= row.po_total_calculated
         elif batch.mode == self.enum.PURCHASE_BATCH_MODE_RECEIVING and row.invoice_total:
+            # TODO: pretty sure this should update the `_calculated` value instead?
+            # TODO: also, should update the value again after the super() call
             batch.invoice_total -= row.invoice_total
 
         row = super(PurchasingBatchView, self).save_edit_row_form(form)
+
         # TODO: is this needed?
         # self.handler.refresh_row(row)
+
+        # 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
+
         return row
 
 #     def redirect_after_create_row(self, row):