diff --git a/tailbone/grids3/core.py b/tailbone/grids3/core.py
index 80c60011..7477ed49 100644
--- a/tailbone/grids3/core.py
+++ b/tailbone/grids3/core.py
@@ -96,6 +96,12 @@ class Grid(object):
         if key in self.columns:
             self.columns.remove(key)
 
+    def set_joiner(self, key, joiner):
+        self.joiners[key] = joiner
+
+    def set_sorter(self, key, *args, **kwargs):
+        self.sorters[key] = self.make_sorter(*args, **kwargs)
+
     def set_label(self, key, label):
         self.labels[key] = label
         if key in self.filters:
@@ -216,7 +222,7 @@ class Grid(object):
             column_formats['checkbox'] = self.checkbox_column_format
 
         if self.renderers:
-            kwargs['renderers'] = dict(self.renderers)
+            kwargs['renderers'] = self.make_webhelpers_grid_renderers()
         if self.extra_row_class:
             kwargs['extra_record_class'] = self.extra_row_class
         if self.linked_columns:
@@ -240,6 +246,20 @@ class Grid(object):
                                           if key not in self.sorters])
         return grid
 
+    def make_webhelpers_grid_renderers(self):
+        """
+        Return a dict of renderers for the webhelpers grid.  We honor any
+        existing renderers which have already been set, but then we also try to
+        supplement that by auto-assigning renderers based on underlying column
+        type.  Note that this special logic only applies to grids with a valid
+        :attr:`model_class`.
+        """
+        renderers = dict(self.renderers)
+        # for column in self.columns:
+        #     if column not in renderers:
+        #         pass
+        return renderers
+
     def checkbox_column_format(self, column_number, row_number, item):
         return HTML.td(self.render_checkbox(item), class_='checkbox')
 
diff --git a/tailbone/views/master2.py b/tailbone/views/master2.py
index f533b10e..a395052f 100644
--- a/tailbone/views/master2.py
+++ b/tailbone/views/master2.py
@@ -102,6 +102,18 @@ class MasterView2(MasterView):
         grid.load_settings()
         return grid
 
+    def get_effective_data(self, session=None, **kwargs):
+        """
+        Convenience method which returns the "effective" data for the master
+        grid, filtered and sorted to match what would show on the UI, but not
+        paged etc.
+        """
+        if session is None:
+            session = self.Session()
+        kwargs.setdefault('pageable', False)
+        grid = self.make_grid(session=session, **kwargs)
+        return grid.make_visible_data()
+
     def make_row_grid(self, factory=None, key=None, data=None, columns=None, **kwargs):
         """
         Make and return a new (configured) rows grid instance.
diff --git a/tailbone/views/purchases/credits.py b/tailbone/views/purchases/credits.py
index 947df67d..ffda8b6c 100644
--- a/tailbone/views/purchases/credits.py
+++ b/tailbone/views/purchases/credits.py
@@ -44,6 +44,8 @@ class PurchaseCreditView(MasterView):
 
     grid_columns = [
         'vendor',
+        'invoice_number',
+        'invoice_date',
         'upc',
         'brand_name',
         'description',
@@ -51,6 +53,7 @@ class PurchaseCreditView(MasterView):
         'cases_shorted',
         'units_shorted',
         'credit_type',
+        'mispick_upc',
         'date_received',
         'status',
     ]
@@ -58,20 +61,23 @@ class PurchaseCreditView(MasterView):
     def configure_grid(self, g):
         super(PurchaseCreditView, self).configure_grid(g)
 
-        g.joiners['vendor'] = lambda q: q.outerjoin(model.Vendor)
-        g.sorters['vendor'] = g.make_sorter(model.Vendor.name)
+        g.set_joiner('vendor', lambda q: q.outerjoin(model.Vendor))
+        g.set_sorter('vendor', model.Vendor.name)
 
         g.default_sortkey = 'date_received'
         g.default_sortdir = 'desc'
 
+        # g.set_type('upc', 'gpc')
         g.set_type('cases_shorted', 'quantity')
         g.set_type('units_shorted', 'quantity')
 
+        g.set_label('invoice_number', "Invoice No.")
         g.set_label('upc', "UPC")
         g.set_label('brand_name', "Brand")
         g.set_label('cases_shorted', "Cases")
         g.set_label('units_shorted', "Units")
         g.set_label('credit_type', "Type")
+        g.set_label('mispick_upc', "Mispick UPC")
         g.set_label('date_received', "Date")