Finish power outlet/feed connection forms

netbox/dcim/filters.py

@@ -1126,6 +1126,10 @@ class PowerFeedFilter(CustomFieldFilterSet):
         to_field_name='slug',
         label='Site name (slug)',
     )
+    power_panel_id = django_filters.ModelMultipleChoiceFilter(
+        queryset=PowerPanel.objects.all(),
+        label='Power panel (ID)',
+    )
     rack_id = django_filters.ModelMultipleChoiceFilter(
         field_name='rack',
         queryset=Rack.objects.all(),

netbox/dcim/forms.py

@@ -2681,7 +2681,7 @@ class ConnectCableToPowerFeedForm(BootstrapMixin, ChainedFieldsMixin, forms.Mode
         widget=APISelect(
             api_url='/api/dcim/power-panels/',
             filter_for={
-                'termination_b_powerfeed': 'powerpanel_id',
+                'termination_b_id': 'power_panel_id',
             }
         )
     )